I've been on 6MP for about 5 months. Prior to this ... Azathioprine for about 9 months. I had to switch due to feeling very "OFF" on AZA and disconnected from the world.
6MP, I still feel slightly off but not as bad as on AZA. So far, the drug has been OKAY. Not a miracle but much better than dealing with a flare up. It for some reason has really made my bowel movements difficult. I now have to take Miralax, literally, every 2 days in a double to triple dose. Otherwise I just won't go much ...
And who knows? Perhaps it is not my 6mp. It could be general IBS.
I don't want to be on this drug for a long time ... But in a sense, it is working to prevent flaring. I am not 100% comfortable on the drug, myself. After I've given my body a rest from flaring (assuming I won't have a flare up for some time), I am going to look into natural and diet approaches to the disease. I have a good friend who sees a nutritionist for her Crohn's and has found success with an elimination diet.
My advice: Do what you have to do to get through today, but also think about the future now and then. Are you comfortable enough to take this drug for some good time and does it truly outweigh the risks?
Keep your head up, you won't always feel like garbage. New developments in science and treatment for autoimmune are on the way ...