I'm shocked that your doctor told you not to get the flu vaccine because you're on immunosuppresants; that's why you need to get it. If you get the flu or pneumonia, your body is going to have a very hard time fighting it. Our son takes 6MP for Crohn's and the first thing his GI told us was to make sure that he gets a flu shot every year and a pneumonia shot when needed.
We've given about 310 at our office and no patients have had problems. My son that has Crohn's got his. I still have to get our other son in; he has severe asthma.
I"m on my way to get mine. My dr., an internist, has told me that since being RX'd with CEBV I must have the yearly flu shot. I've gotten every year, since Grant was a cadet.