Long story very much shorter, we have worked our way through almost all of the thyroid meds -
Synthroid,
Levoxyl, Thyrolar, even Armour - and right now I am taking Levothroid and Cytomel. So far, so good. We don't know exactly what it is, but there is no doubt I am reacting to something in the thyroid meds themselves.
I wouldn't recommend going off meds for an extended period of time but, if your symptoms improve in a few days, you should ask to have your thyroid meds changed.