male urinary/penis issues

My boyfriend has been having some issues down there for a few months now. The issue started when he'd feel a pain at the tip of his penis after urination. He went to a urologist. He had a chlamydia/gonorrhea test and it was negative. The dr gave him some antibiotics. Hes been taking them for 2 months with barely any relief. He had a cyctoscopy that showed mild irritation of the prostate. He had a urine test which showed no bacteria. He had extreme pain after the cystoscopy which eventually subsided. Now he has developed new symptoms..he has pain with ejaculation and even trouble getting a full erection and keeping it erect. Anyone have any idea what this could be? The dr doesn't seem like much of help