Prolonged bout of blood in semen

I am 53 years old and have quite an active sex life with my wife of 50.  About 3 years ago, after intercourse, I noticed blood seeping from my penis.  I immediately thought it may be something serious so I phoned the NHS helpline who told me it was probably nothing to worry about but advised me to see my GP.  He gave me a prostate examination and referred me to a specialist.

Whilst the specialist was examining me for prostate problems he discovered a hernia that I knew nothing about.  He prescribed some antibiotics for a prostate inflammation and advised me to have the hernia repaired as soon as possible, so in November 2005 I had the hernia operation as advised.

Once the hernia repair had healed I had no sign of blood in my semen for about the following 6 months but ever since then it has gradually got worse, starting with just a trace but sometimes there is quite a lot of fresh bright red blood. Just lately it has got really bad with a lot of blood coming from my penis.

I have spoken to my GP about it on a couple of occasions and he says it happens and not to worry about it.  But I am worried and my wife is also worried enough that it's starting to put her off having sex.  I sometimes wonder if it could be anything to do with the hernia operation I had as it is still sore in the area of the operation.  It probably has nothing at all to do with it but I would like advice from someone other than my own GP.  I would welcome any thoughts or opinions on what I can do to stop this blood coming from me. I have seen ads for prostate medications on the internet and I am wondering if they, or any other supplements are of any use in treating this.