SSI does not require you to attend therapy. for the first few years, they will probably "reassess" you once a year, and you will need a Pdoc to say that you are on meds, or otherwise still disabled. that's all. you are not required to even tell the new clinic that you have been seeing anyone, except a Pdoc, and you don't have to sign a Release of Information form if the new clinic will accept you without it.
good luck~!