Well, if you don't get better, keep persisting in finding answers. Perhaps even seek a second opinion if you don't improve quickly. They did do stool samples to rule out infectious causes, right? Although if you had infectious colitis, that would have shown up in the scope, too. Very frustrating when you are suffering and doctors cannot find the cause. A year-and-a-half before I got UC, I suffered from severe unexplainable lower back and abdominal pain. I got a CT scan, and ultrasound and bloodwork done and everything came back normal. After a few months, it went away. I kind of wonder now if it was UC, but I had no other symptoms besides pain. It was very frustrating that the doctors could not find out what was wrong. I was in college at the time and the college health center nurse kept insinuating that I had an eating disorder! I wonder if maybe you have IBS. There are anti-spasm medicines available that could help that (Bentyl, Donnatel, and some others).
34 years old; diagnosed UC March 2007.
Latest scope: 9-29-16: "mild-to-moderate" chronic and active proctosigmoiditis (infectious cause). Battled reoccuring campylobacter & c diff. Oct-Dec 2016. Healthy since Dec. 25, 2016 until I started smoking May 2018. 25 mg pred. Trying to re-quit smoking. Maintenance meds: Delzicol, 6, 2xday; Rowasa nightly; Singular & Allegra for allergies; Xanax