All I can tell you is about my experiences and what other guys and wives have told me here. Post-surgery aches and pains are different and sometimes mysterious.
I never had post-surgery orgasm pain. BUT, like Tamu. another member here, I sensed something missing in the area where my prostate used to reside. And sometimes, I'd get this rap-a-tap-tap feeling -- like a finger trying to poke from within the area where my prostate was -- starting from behind my scrotum and proceeding up to the top of the crack of my "you-know-what." IT DROVE ME NUTS! (Tamu too , I think) BUT IT'S GONE NOW!! Give it time and hopefully your weird sensations will go away too.
I've talked to a few guys who've had surgery and each case has its own little surprises.
BUT --- Talk to your doctor.
You'll be fine.
Patience my man. Patience.
We're all in this boat together.
Hang in there.