Bladder Infection?

It could be a side effect from the abx. They often can cause pain in the bladder/bowel/stomach area and sometimes create odor, though not often. Mind you people usually aren't on three abx for multiple months. I would definitely bring it up to your doctor, though. Don't want to end up developing super bugs as a result of the abx!
It's probably not super serious, but it's definitely better safe than sorry.