I think that what Talis said was right. Also, I think it all depends on how bad an effect on your life the P is having. I coped for about 20 years with severe P, refusing all drugs, but in the end I had no real quality of life - constant severe pain and itching, dehydration, organ failure - am now on Humira, a biologic, feel great and am hoping it continues to work and that I can stay on it!
Good luck with whatever you decide!
hk