Sorry, just read your post. Yeah, BIG difference BTW T-3 and T-4.
You gotta go real easy on T-3 and you HAVE TO KNOW how much you are taking. You pyramid and drop. If it's T-4, that is much less potent. Mixing the two is serious.
T-3 by itself works fantastic at very small doses unless you are thyroid deficient.
Another problem is that you may have had a hyper thyroid and a fast metabolism prior to taking the stuff. These things have to be investigated prior, otherwise... well, you could wind up in an ER.