I am very sorry you are in so much pain! I am going through similar things myself and it is no fun for sure.
I know this is the "answer" for everything, but have you talked to your doctor about an infection, possibly pouchitis? I was positive that I didn't have that, but the difficultly emptying pouch, some blood, and extreme pain are all symptoms that I had too. I am starting antibiotics now and I think they are starting to help especially with the difficulty emptying my pouch.
I do hope you can find some relief soon.