Why do I have pain in my testicles and prostate before, during and after ejaculation?

I am 2 years post-vasectomy and have had this issue since it was done in May 2009. It doesn't happen so much during intercourse as much as during masturbation, although it does happen every so often during intercourse. The pain consists of pain in the testicles and abdomen. It is more apparent when I "stop n go". On a scale of 1-10, the pain can get as high as 8 or 9, and sometimes even a 10. I do notice that if I masturbate several times daily, it doesn't seem to happen as bad. But if I go so much as a day without ejaculating, fuhget aboudit!! ALSO, I notice a lot pf pressure in my prostate and maybe some pain with it. It feels like I have a big poop waiting to come out. But after I have a BM, the pressure and same feeling still exist. Again, this is POST VASECTOMY, ONLY DURING INTERCOURSE OR MASTURBATION, and it there is a lingering "soreness" in my testicles after all is said and done. That lasts for as much as a day or more. Lots of info, any questions please ask. ***AND PLEASE NO COMMENTS LIKE, " GO SEE THE DOC", "GET IT CHECKED OUT" OR ANYTHING OF THE SORT. I AM MAKING AN APPOINTMENT SOON TO GET IT LOOKED AT. THANKS FOR ANY ADVICE!!