I was also afraid there was something else wrong with me, but it was just my hypothyroidism.

Somewhere I read that the body will sometimes react the opposite way with an increased (or starter) synthroid dose. I know I initially would feel good after increasing the dose, then not so good during the middle part of the 6-8 weeks I was on a dose, sometimes better at the end.

From my experience I would want to stay on the .50 for 6-8 weeks before I went on. Some docs switch people around like that. Mine did not because he said that the body would have bad reactions to sudden increases, that it had to be done slowly. Not what I wanted to hear, I can tell you. It was winter and I wore a heavy fuzzy robe over flannel pjs, could pile blankets on me, then I was warm enough. An alluring sight to behold I'm sure!

I really think it is not anything to be alarmed about. Sometimes I had a few heart palpitations. That's supposed to be hyperthyroid, but when your thyroid is being adjusted you can have them, especially when your thyroid level is unstable.

Providing the doctor knows how to treat thyroid (and GPs can be the best, depends) then he probably thought he'd take him down a dose because of the reaction more so then thinking the dose would be ultimately too much for him, and then decided to increase it because he felt that your husband was hypo. But jumping to 1.00 from .50? That is too abrupt for the doc that was treating me. There are stops at 75 and 88 before you get to 100 (or 1.00).
Best,
Anne