Hi trents, just an update to my post, I had my follow up with my gastroenterologist. Scheduled my endoscopy for July 17th and got my biopsy results back July 28th. I have my official diagnosis now and I do in fact have Celiac disease. I'm slowly starting to switch my diet over to completely gluten free. My goal is to be completely gluten free after Christmas this year. I know I should be stopping completely now, but I am have a really hard time with change so my doctor told me I could do this gradually if it was easier for me. Now I know though and can make myself better with simple steps, no medication and have peace of mind knowing what I have is not the end of the world. Thanks again for your support. I've learned a lot over the last couple of months.

@knitty kitty thank you for this suggestion.  Yes definitely.  Actually, since you brought it up, I just looked to see what amount of B vitamins my multi-vitamin had in it. I just realized that not only am I taking the version of thiamine that you mentioned doesn't absorb well, but also that I inadvertently reduced the amount of thiamine that I'm taking daily over time.  I'm just now looking at the bottles for the last three multi-vitamins that I was taking (including the current one I'm taking now).  I started with thiamine mononitrate at 25mg but that turned out not to be a gluten-free multivitamin, so then I switched to a gluten-free multivitamin with 1.1mg thiamine mononitrate, and then when my GI doc advised me to switch to an independent iron pill, I got a new multi-vitamin gummy that lacked iron. Now I'm realizing that this gummy only has 0.14mg thiamine mononitrate.  So not only are these not the right kind of thiamine but they are waaaay low.  Probably going on a gummy is a bad idea anyway... I will look into a B complex and if you have any suggestions of a specific one that worked for you, I would gladly take the suggestion!  Thanks so much.  this is such an awesome forum!!!

Welcome to the forum, @AnneBSunflower, I have Hashimoto's, too.  I've learned some things that have helped with mine. This study says it's common to find anti gluten antibodies in Hashimoto's.  So antibodies aren't necessarily due to gluten ingestion.   https://pubmed.ncbi.nlm.nih.gov/31149170/   Take a B Complex supplement and Benfotiamine, a form of thiamine shown to promote intestinal healing, and Vitamin C.  This study found a higher rate of thiamine and Vitamin C deficiencies in people with Hashimoto's.   https://pubmed.ncbi.nlm.nih.gov/37278003/   Try cutting back on the amount of iodine in your diet.  Iodine, even in small amounts, can stimulate the thyroid which in turn stimulates the immune system which increases antibody production.   Dairy and eggs are high in iodine.  Switch from iodized salt to Pink Himalayan salt.   https://pubmed.ncbi.nlm.nih.gov/9703374/   Supplement with Selenium, a mineral that helps the thyroid function and calms the immune response in the thyroid.   https://pubmed.ncbi.nlm.nih.gov/37033262/ Hope this helps!  Keep us posted on your progress!

@Rejoicephd, Would you consider adding a B Complex to your supplements?   I was taking a multivitamin and still became deficient.  There's a question as to how well multivitamins dissolve in the digestive system.   I found taking a B Complex and Benfotiamine, a form of thiamine shown to promote intestinal healing, very beneficial in my recovery.   Some B Complex supplements use Thiamine Mononitrate which is not well absorbed nor utilized by the body.  Thiamine Hydrochloride is better.  Benfotiamine is easily absorbed.  If not needed, the B vitamins are easily excreted. High B12 out of the blue could be masking a lack of other vitamins that work with B12, like Folate B 9, Pyridoxine B 6, and Thiamine B 1. Meats and liver are great sources of B vitamins.  B vitamins are needed to make digestive enzymes that digest protein, fats, and carbohydrates.   Do keep in mind that most gluten free processed facsimile foods are not required to be enriched with vitamins and minerals lost in processing like their gluten containing counterparts.  The more carbohydrates you eat, the more Thiamine is needed to process them into energy instead of storing them as fat.   Hope this helps!  Keep us posted on your progress.

@kopiq,  Your case is not hopeless.  Doctors are not required to learn much about nutrition.  Celiac Disease causes damage to the lining of the small intestines resulting in malabsorption of essential vitamins and minerals.  The eight essential B vitamins  and the four fat soluble vitamins (A, D, E, and K) are chemical compounds that our bodies cannot make, so we must get them from what we eat.  If we're not absorbing sufficient amounts from our food, then supplementing with vitamins and minerals help boost our ability to absorb them.  The B vitamins are safe and water soluble, easily excreted in urine if not needed or not absorbed.  Essential minerals are important, too.  Magnesium and Thiamine make life sustaining enzymes together.   Blood tests for the B vitamins are notoriously inaccurate.  By the time a deficiency shows up in the blood, you've been deficient for a few years. The best way to tell is to try taking a  B Complex and looking for health improvements. Taking a B Complex and Benfotiamine, a form of thiamine shown to promote intestinal healing, helped me immensely.  I also took Vitamin D and Magnesium Glycinate and others. Did your doctor offer any treatment to correct your critically low Vitamin D level?   Mine was lower than yours.  My doctor prescribed the less bioavailable form D2.  Our bodies utilize the D3 form better.  I bought over the counter Vitamin D3 supplements (1000 IU) and took several with each meal.  Taking high doses of Vitamin D to correct a deficiency is safe and very effective at improving health.  I started feeling better quickly.  Vitamin D helps regulate the immune system and lower inflammation, as well as makes hormones. Laying out in the sun cannot correct a Vitamin D deficiency unless you're below the 33rd parallel (on a tropical island with abundant exposed skin for several months).  Ultraviolet rays from the sun destroy the thiamine in the body.  That feeling of lethargy is because the sun exposure broke down thiamine into unusable pieces.  Thiamine and the B vitamins make ATP, the energy currency the body requires to function, to make digestive enzymes, to regulate body temperature, to think, to heal itself.  We need more Thiamine when we're outdoors in hot weather, working or exercising.  Thiamine deficiency doesn't cause heat stroke, but thiamine deficiency can make heat stroke symptoms worse.  We need more Thiamine when we're physically ill or injured or undergoing medical procedures.  We need more Thiamine when we're emotionally stressed or traumatized.  Anxiety and depression are very early symptoms of thiamine and other nutritional deficiencies.   Rashes can be caused by deficiencies in Niacin B3, Vitamin A, or Vitamin C.  Some rashes can become worse with exposure to sunlight.   The B vitamins are needed to make digestive enzymes that will help you digest fat and proteins better.  Meats are an excellent source of B vitamins.  Sweet potato and plantain are high in carbohydrates.  The more carbohydrates one eats, there is a greater metabolic need for thiamine to turn them into energy, ATP. Can your doctor refer you to a dietician or nutritionist?