I had two ulcers in my TI at the time of my colonoscopy, which was a little over a year ago. Even with those, and having inflammation in my cecum and ascending colon, my first GI refused to diagnose me. Anyhow, I have a great GI now who did diagnose me.
I wasn't on anything at the time they found the ulcers. I do know that my Crohn's symptoms kept getting worse and worse, even with being on prednisone, imuran and pentasa. I got started on Remicade back in November and that has honestly helped me feel a lot better. I am sorry to hear it didn't work for you!
This is an awful disease and I hope you are able to find something that will help you soon! Please take care and keep us informed!