For the last 4 months I have worried/stressed non-stop about having contracted a sexual disease.  

I have tested myself numerous times (a 10 panel test at Quest which covers the typical STDs), the most recent at the 12-week mark.  This test included trich and MG.  The good news is that I have consistently been negative.

My problem is this:  for the last 3 months my testicles have been aching and something inside my penis burns/stings. It does not hurt to urinate, although the tip of my penis can sting after urinating.  There has been no discharge that I've noticed and my urinalysis did not have any bacteria, only blood which has been present for years.   It is very odd because I can't point to a specific spot on my penis that hurts. It's just something inside it towards the front.

My urologist thinks the pain is stress-induced (maybe non bacterial prostatitis) and he may be right. Nonetheless, the recurring sensatios are driving me NUTs.  I've tried pelvic exercises to no avail.

Any thoughts would be greatly appreciated!

  

1.  You can be entirely sure that you do not have an STI from your brief, low risk encounter (most commercial sex workers do not have STIs and when partners have STIs, most single exposures do not lead to transmission of infection).  Your results are entirely conclusive and there is no reason whatsoever for further testing.  To do so would be a waste of time and money.

2.  Your symptoms sound like the chronic pelvic pain syndrome which is well described in Wikipedia.  This syndrome is well recognized in the urological community and it sounds like your urologist is thinking about this in the same way I would.  Antibiotics are of little use here.

Finally, I would add that on occasion when persons find themselves worried about an STI, they tend to focus far closer attention to their genital tract and genital symptoms than at other time.  In this setting of heightened awareness, there is a tendency to notice otherwise normal sensations that would otherwise be overlooked. This may be adding to your situation.

I hope these comment are helpful.  If there are further questions, please don't hesitate to use your up to two follow-up questions for clarification.  EWH