I show the classic symptoms of thyroid disease but my levels are normal. what else could it be?

Anything else: since you did not specify your symtoms: are you a physician: what could it be?- I think you should get a complete medical evaluation.

Thyroid Disease: If your lab work is all fine relax and this could be anxiety. Your doctor will not risk treating you for a thyroid disorder since the treatments are to prevent more dangerous problems if left untreated, Have confidence in your doctor is the most important decision for your well being and if you feel there is not chemistry between the two of you look for someone that you feel confortable with