Prostatitis

I'm a 45 years old.

About 7 weeks ago I had painful ejaculation and some mild testicle and pelvic pain that creeped up my left flank. Outside of the ejaculation all pain was more discomfort then pain. Went to my family Dr. and he prescribed 8 days of doxycycline. This cleared up the pelvic and testicular pain, plus the painful ejaculation. The left flank pain remained a nuisance and sometimes would be briefly sore after ejaculation. I saw him again and was prescribed another 5 weeks of doyx for the lingering symptoms. I also had a prostate exam and both times gave urine. All tests negative for infection or blood. Symptoms where waning until this morning. I woke up with really painful lower middle back pain that only hurts when I move in certain ways. My urination has always been fine and I'm not experiencing any pain other then in the small of my back. But it's really painful!
Anyone else have a symptom pattern like this?