I know I'm hypo, but not enough to treat. I had been on Synthroid and it worked fine for a year or so. Then I started getting palpitations, so stopped. When I tried to go back on it I ended up in the ER with palps.
Then a couple years ago I tried it again, in small doses. After 6 weeks or so I developed double vision. Everyone kept saying that couldn't be the cause, cause that's a symptom of Hyper. Anyway, I stopped the meds and 3 weeks later my vision was back to normal. The human body is a strange machine.