i repeat....5000 mcg of B12 daily, on an empty stomach!.....not 500 mcg...
and Glenn is correct.....check into celiac/non celiac gluten sensitivity....esp with your addition of hypothyroid......WHAT testing was done for your blood sugar? just fasting? not enough, in fact not worth the powder to blow it to you know where.....fasting insulin, 3-5 hour GTT, etc.....you might try benfotiamine.....good luck