Problem in urinating. On my sex life?

I am 24 yrs male.From last 1 month i am having problem in urinating. Whenever i go to urinate very small volume of urine is there and that too with very poor flow. I consulted an Urologist and he asked me get my KUB scan and urine culture done. Both very normal and in Urofloew there was intermittent flow and maxm flow was 12ml/s and that too for 1 sec. Average flow rate was 1ml/s. He did my rectal examination with his finger and told me that it could be Prostatitis and since the urine culture is normal so it can be Abacterial Prostatitis and he gave me medications( Alphablocker and antibiotic). I started feeling normal but after 15 days the problem has relapsed and i am having mild pain in thre area near to left side of penis. What you think the problem might be? If its Prostatitis then is it normal in prostatitis for symptoms to relapse? Can i be cured and what effect will it have on my sex life?