I'd be interested in knowing exactly what your thyroid levels are, if you don't mind. Many people who are "in range", but borderline are considered "fine", when they actually have symptoms of hypothyroidism, such as fatigue, weight gain or others.
I'm very sorry to hear that you have Celiac, which is an autoimmune disease. Please be aware that having one autoimmune disease, makes you prone to having/developing more. You should ask your doctor to test you for thyroid antibodies and to have your vitamin B12 levels tested.
The low blood sugar is hypoglycemia, which is the opposite of diabetes. In order to keep your blood sugar levels stable, you need to eat small meals consisting of protein and fiber, every 2-4 hrs. Did your doctor suggest a nutritionist or dietician to help you get started with the diet for celiac?
Since celiac is an allergy to gluten, you will need to avoid wheat, rye and barley, at least. Some add oats to the list to avoid, others don't agree. Because whole grains are generally considered to be part of a healthy diet, you will need to come up with other foods to replace the fiber, vitamins/minerals that won't get from grains. You can still eat corn. This is where a nutritionist may be helpful.
I got my test results back today. My thyroid is fine, but it turns out I have Celiac Disease and low blood sugar. Now what? I forgot he decided to do the Celiac test so when the nurse said that my Celiac test was positive/elevated I was surprised. She asked me if I had been fasting because my blood sugar was very low. I told her I had not been fasting.
I agree with OytheGreat - your doctor is most likely looking for hypothyroidism, insulin resistance or other issues. Too bad most doctors don't consider sudden weight gain, as something to look into; they usually just tell us to "eat less/move more".
He is probably checking for hypothyroidism and some other issues. Maybe he knows you don't have a history of sudden weight gain, so he's checking to see what's going on. Smart doctor. If only all the doctors did this instead of just telling us to "eat less and exercise more."
I think the concern came from that and my other symptoms.
15lbs is nothing! Lol. I gained that just in 5mths over winter due to not being able to get to the gym. It's a bit strange that your Dr is so concerned.
Here is some information about Celiac Disease.
http://www.nlm.nih.gov/medlineplus/ency/article/000233.htm
You will need to follow a gluten free diet from now on. I'm not sure about the low blood sugar. It may be related to the Celiac Disease or it may not. I'm also not sure if going gluten-free will negatively affect your blood sugar levels. It may help, because it may keep the body from releasing too much insulin which can cause low blood sugar.
Thankfully, there are a lot of resources for people with Celiac Disease, everything from recipes and eating plans.
Most people with Celiac Disease suffer from weight loss, but you may be an exception. Getting this disease under control will probably help bring the weight down, and it will likely make you feel a lot better.