I think that it is a good idea to get tested. It is important to find out if you have issues like this, and if it turns out it is your thyroid that's not a terrible thing. Yes, it would tell you what is going on. There are treatments for thyroid troubles. There are also diets for thyroid, too.

Either way, it is a good idea to get tested for it especially if you're losing weight. That's not so good. She may also want to test your GAD level and your c-peptide to see how your body is producing insulin and if you have the antibodies for type 1 diabetes, just in case. Mood swings are also common with blood glucose levels that are too high and too low.