I'm sorry you've been having such a rough time. I'm thinking you may have accidentally ingested something containing gluten, and that's what caused your reaction. A lot of people will react quite severely to even a tiny bit of gluten. That's why there is so much on here about avoiding cross contamination. Even though you've been diagnosed with NCGS, you still need to live as though you have actual celiac disease, and be very careful not to cheat. Your body will punish you for it. :/ In the meanwhile, nurture yourself kindly and gently, just as you would after a severe bout of food poisoning or intestinal infection. Comfort foods, like broths and soups and smoothies. You might want to avoid lactose for a few months too. Sometimes we lose our ability to digest lactose when our intestines are damaged and vulnerable like yours is right now. And remember healing takes time. So does learning the gluten free lifestyle. Expect some setbacks occasionally. You WILL get better!
Are you vegan or vegetarian? I am concerned about your lack of protein and fats in your diet. These diets can work when you are also gluten free, but as a celiac you can be malnourished. It is hard to heal when you are slowly starving yourself. No offense, but some newly diagnosed celiacs end up with food disorders. Perhaps working with a dietician can help.
What actually are your blood glucose levels? Did you know that just as Hashimoto's is common with celiacs, so is type 1 diabetes? Ask your doctor for antibodies testing for Type 1 diabetes (TD1), if your blood glucose levels are not in the normal range. You can develop TD1 (LADA) at anytime. For adults there is a "honeymoon" period which can last for up to five years.
Be on the watch for other AI issues (besides TD1) too.
It is so important to monitor your health after a celiac disease diagnosis!