That actually sounds very similar to what I have been going through as well for the last few months. It started as pain in my left testicle and now there is also pain in the perineum but the testicle mostly feels better. I did several rounds of antibiotics a few months ago despite the cultures coming up negative. Now I've been taking 800mg ibuprofen since the last visit to the urologist.
Do you have other symptoms besides the groin/testicle/perineum pain? How long have these symptoms been present?
Other urological symptoms? Yea, sometimes I get a burning sensation when urinating and a burning sensation on the left side of the head of my you know what.
I also seem to get the burning sensation into my left foot at the same time, so I really think this is from AS, NOT urological disease. Sigh. Add it to the long list of AS symptoms.