i'm went through the same thing. same area, same side. i made the mistake of masturbating during said pains(please don't ask why) , and it made it much worse, it lasted for about 3 days afterwards, with use of painkillers (800 Mg of ibuprofen or a tylenol). it wasn't but about a week or so ago, and now i'm having the same problem, but it's mirrored, on the right side, this time i noticed it immediately after yet another ejaculation from masturbating....i don't know if this helps any, but i've been through it, and if anyone can help either of us out, it's much appreciated.
~the_fries_guy