fsgs

i was diagnosed with fsgs last year. i was put on cyclosporin and was told the disease seems to be stable but need more blood tests and stuff to make sure. over the last 2 weeks or so i have been extremely tired and feeling nauseas. i was told by the specialist that it not from the medication, and to take a preg test, which was negative. i feel weak and tired so often, i am over it and very frustrated. has anyone else gone through this. i feel confused as the specialist did not seem concerned but when googled it said that my kidneys could be at fail point or that it is part of the disease. i am unsure what to think really need some help.