My type 1 daughter for 9 years has been experiencing really low blood sugars all of the sudden. She is 17 and has gone from a TDD of 45 to around 30. Along with this she is really irritable and seems kind of depressed and for the first time ever unmotivated. She has received all sorts of good news recently - got into her first choice college with a large scholarship- so I don't think this is purely teen emotions. Because of her change in demeanor and because my older daughter has Hashimotos- I had her endo test for celiac and thyroid. Her celiac seemed good - her immunoglobulin A was low though. The part that is curious to me is that her TSH was in range but on low side and her T3 was out of range low. They are going to run more blood work- but fasting this time. Anybody have any experiences they could share that might give me a clue as to what we could be dealing with. I really hope to get this all sorted out before she leaves for college.