Your symptoms are exactly the same as mine were when first diagnosed in 1998. The only thing I could contribute is to say that fiber made my condition worse. Stick to a low residue diet. Instead of milk I use Lactaid in my rice cereal.
As far as medications go, the only drug that helped me into remission was prednisone but now I have become prednisone dependent and you sure don't want that to happen.
The best of luck to you. I will keep you in my prayers for a speedy return to health. Just sit tight and wait for the biopsy report, write down all the questions you may have for your GI doctor and if you are satisfied with the answers he gives you, follow his advice.
We are all here for you!