I had all those tests done many years ago. My symtoms go like this. Every morning within the first 3-4 hrs I have at least 3 bowel movements. There is usually not much there each time. Even though I feel like i have to go badly. I usually have mild discomfort. When the severe pain comes on, It starts just below my belly button, as im sitting on the toilet the pain intensifies. I can only pray for relief.As soon as mt bowels move, the pain lessens dramatically. Either seconds or a minute or so later, the pain returns quickly and the cycle continues for usually no more than 40 minutes. Im honestly begining to wonder if my brain or subconsious part of my brain is sabatoging my body. The reason i say this, is because when i had major back surgery 2 yrs ago, screws and rods in my spine ), I went for many months without the severe pain. I dont understand that at all, i think i might be physco or something.