@cristiana, Yes, I found high carbohydrate meals would trigger mine as well.  I learned from Dr. Lonsdale that high carbohydrate diets can deplete thiamine.  Heart palpitations are a symptom of thiamine insufficiency.  Diets high in refined simple carbohydrates (empty calories) need additional Thiamine to process the carbs into energy.  The more carbs one eats, the more Thiamine is required to process the additional calories.  500 mg more Thiamine is required for every additional one thousand calories.  This is named "High Calorie Malnutrition."  Sufficient calories are being consumed, but not enough of thiamine to burn the carbs for energy.  Instead to ration out the small supply of thiamine, the additional calories are stored as fat.  It takes less thiamine to burn fat than to burn carbs.    Do read Dr. Lonsdale' article here... Hiding in Plain Sight: Modern Thiamine Deficiency https://pmc.ncbi.nlm.nih.gov/articles/PMC8533683/

I used to suffer with migraines, but I have rarely had one since I started taking additional Thiamine.  The form called TTFD (tetrahydrofurfuryl disulfide) can improve neurological functions in the brain.  Benfotiamine is another form that improves migraines. Look at the label on your B Complex vitamins.  It should tell you what form of thiamine is in it.  If it says thiamine mononitrate, you're probably not getting sufficient thiamine.  Thiamine Mononitrate is a form used in vitamin supplements and foods because it is shelf stable.  Shelf stable means it won't break down when exposed to heat and light sitting on a shelf waiting to be bought in a store or warehouse.  It also is very difficult for the body to break it down and utilize it.  Only about thirty percent of the amount of thiamine mononitrate on the label is absorbed.   Do take a look at Dr. Lonsdale and Dr. Marrs' website hormonesmatter.com.  Dr. Lonsdale has done much research on Thiamine.   Keep us posted on your progress!

@DebJ14 The Spectracell Test for Micronutrient Deficiencies tests  intracellular levels of the nutrients INSIDE Leukocytes (white blood cells) which are in the bloodstream.  This still is not reflective of current stored vitamin levels inside organs.   The genetic MTHFR mutation does occur frequently with Celiac Disease.  Taking the methylated (activated) forms of the B vitamins is necessary.   A good multivitamin may not be sufficient to correct deficiencies.  Malabsorption due to the intestinal damage of Celiac Disease may prolong deficiency states.  Vitamin deficiencies need to be corrected quickly to prevent long-term problems.  Taking a B Complex twice a day increases absorption.  Taking a multivitamin as well is fine as multivitamins usually also contain some necessary minerals.

My TTG IgA and IGA are elevated mildly, right at borderline positive,e but my EMA is negative. All my vitamin levels are normal as well as cbc and metabolic panel. What is the likely cause of this? I have been on gluten-free diet for 15 yrs nearly. 

They do work for me. I am feeling much better now that I am watching my histamine intake and only take the DAO once  a day.   I had acid reflux for 12 years and was prescribed PPI's.  which I refused to take. Ranitidine was prescribed as an option that I did use only as and when I had chest pain. They were prescribed for me to reduce the acid in my body.