Several Years Ago About 15 I Had A Goiter And

Several years ago about 15 I had a goiter and had to drink some radioactive stuff to kill it. And have been on thyroid meds since. But I believe my thyroid could still be out of whack. I have thinning hair badly and have problems adjusting with cold and heat. And get upset easy. I also have epilepsy and had 2 brain surgery to fix this condition. But still take meds for seizures as well as thyroid meds. I'm not sure if its my thyroids or from brain surgery or menopause.