It's often suggested to get those Vitamins and minerals tested and up to optimal levels (not just within range).
We have quite a few new members who may benefit by asking for these simple blood tests and eliminating deficiency (very common with Thyroid problems). If your doctor won't do them, it may be of benefit to have them tested privately.
For starters - Irons - ferritin, folate, B12 and Vitamin D.
Please don't underestimate their importance in solving the Thyroid puzzle. J