I had my thyroid removed 12 years ago. I have struggled more than most in regulating my medicine, but have been on same dose for about 7 years. I have not been feeling well, aches, joint issues, heart issues last year, etc... and i finally checked my thyroid level again! TSH was zero but t3 and t4 are in range. How can this be? The doctor wants to 1/2 my dosage to .7 mg and I already can't lose weight so who knows what I'll be in the next few months. Can anyone explain my results and should I get a second opinion? By the way, I have started eating a more low carbohydrate diet because it seemed like I was "crazy" on sweets, etc... Can this have affected my TSH? Help!