I don't know what meds you came off of or how long ago you stopped them but I think that nausea when coming off is usually pretty short-term and if you are having nausea now that you may have another reason for that (stress, GERD, an ulcer, gall bladder, other random things--I just named things that cause nausea btw, not saying you have any of them) and you probably do need to get checked out.

How about therapy with a different therapist to see if you might find someone you trust a bit more? I had to try several therapists to find someone who met my needs well but I did find someone eventually who I don't feel paranoid at all with.

Glad you are back, sorry it is because you are not feeling well.