Hi oneday and Poepad, welcome to HealingWell!
Oneday, I'm not too convinced you have IBS. I'm no expert though, this is just my personal opinion. Constant pain and bleeding are not indicative of IBS. For someone to rely on pain pills every couple hours on a daily basis seems to have something more going on.
All those invasive tests indeed are uncomfortable and embarrassing, and I feel for you that you have to go through it. But, they are so necessary. Hopefully they'll find your problem soon. You should be scoped, biopsied, and even MRIed. In the meantime you should probably eat an extremely low fat diet and stay away from caffiene, alcohol and carbonation as much as possible.
Maybe you could also check the UC and Crohn's forum to see if any people there have as much pain and bleeding as you do. ???
Co-Moderator for the IBS Forum