hey there. I am IBS-A. I literally change from C to D in a matter of days. Im sorry about your pain. My best advice to you is to make sure you do not have an intestinal blockage. About a year ago, I was IBSC only, i ate safe foods, but i constantly had pain.. even after a BM. I finally got me doctor to give me an xray and he said that i was so constipated that i had an intestinal blockage and that was causing me all the pain. Get well soon.