Had a follow up visit with my urologist where he did a cystoscopy. This showed some scar tissue and inflammation, but nothing else significant. The CT scan also came back clear. He diagnosed it as an infection and prescribed bactrim, but also sent a sample to the lab to make sure it was the correct antibiotic for the infection. I've been on it for a few days now and things are getting better every day; so, I think my problem is solved.
Thanks for taking the time to report back. Fingers crossed that this is the solution.