Sorry that your having such a bad time.
I have no experiance with cellcept, so can't really help you with that.

I was just curious if maybe something else might be wrong with you. Maybe thats why the MG is getting out of hand.
Some times they won't look for other things, have you considered this ?
Even though I havn't been dx'ed with MG I did take mestinon in the beginning.
It really helped me out, but then I found that I was also gluten sensitve an I quite eatting that and wow I was able to stop the mestinon.

Just a thought, hope things settle down for you.
Take care, Patricia