I will try to give you an answer, but I’m perhaps not the best source: I’ve always felt pretty good when diagnosed as hypo. Basically, the body slows down. The symptoms are often the reverse of what we experienced while hyperthyroid. The pulse rate will drop (less than 70 bmp). We feel cold more easily (as opposed to hyper when we typically always felt too warm) . We can get constipated (whereas with hyper our bowels moved more regularly than normal) . Fatigue is also a symptom. Fatigue is a symptom for both hyper and hypo. My experience with it, though, was that when I was hypo, I could get out and exercise (wisely) and would feel less tired. When I was hyper, exercise made me MORE tired. Hair will tend to fall out more. We don’t go bald but there were times when I thought it had to be imminent: I was dropping hair as badly as my collies do.
As I said, I felt pretty good when I was diagnosed as hypo. Sometimes, after having been hyper for so long, however, even normal levels of thyroid hormone may make us suspect that we are hypo. The key to really feeling normal for me was to make sure I got my levels checked if I thought things were off, and if they were not, to get out and exercise a little (I am not an exercise nut, but I do take walks, if only around a mall). Getting a bit of exercise typically energizes me.
