Cutting long story short, I am too embarrassed to say this to doctor but I bought a prostate massager. 
A day after i used it i saw blood in my sperm. 
Ive stopped using it and now the blood has gone very very light. 
It still keeps stinging when I urinate and no infection in tests. 
Doctor has sent bloods off to rule out anything serious. 
My question is why does it keep stinging when I urinate and keep seeing very light blood in sperm? 
Havei caused any damage to prostate?