Causes for persistent testicular/scrotal pain

I have been living with frequent urination and scrotal pain for almost six months.  It started with what my doctor thinks may have been an acute bacterial prostatitus in early July.  I was in so much lower back and lower abdominal pain I went to the emergency room, where the did a CAT scan for kidney stones.  The pain subsided, and I was put on Cipro.  I had frequent nighttime urination and left side scrotal pain so I was put through 2 to 3 week courses of Cipro and Bactrin and one other antibiotic for the next 4 months.  They did a prostate expression culture and came back with a staph infection.  They also did a TURP, a flexible sygmoscopy, a lower GI Cat Scan with contrast, all came up with nothing out of the ordinary.  Then over the winter break, my left scrotum swelled up to 3-4X normal size.  They did an Ultrasound and found a hydrocele and possible hernia.  With more Cipro and ibuprohen, the hydrocele is much smaller, but I still get sharp pains at the based of my abdomen on the left side, and the testicle is sore.  I also still have frequent day and night urination. Is there something they may be missing.  Stress seems to make it worse.