I have been on cytomel ever since I had my TT for cancer in September '07, just a month b4 you. Right after the TT, I was on cytomel only, then post RAI, both cytomel and levothyroxine. You don't say why you "tapered off" the cytomel, which is interesting.
I actually asked my endo to get off of the cytomel and just up the levothyroxine. He had wanted me to take half a 25mcg table in the morning and half in the early afternoon. Me being such a "pill person", I always screwed that up, We decided that I would try taking it all the morning and that has been working fine for me. I said a lot of this in this thread earlier today:
http://www.medhelp.org/posts/show/469406 My point is that some of us can metabolize and make t3 from t4, others can't and need help from Cytomel. If you felt better on Cytomel, tell your doctor and bypass the PA altogether. She apparently doesn't know what she's talking about!