Hi,
Over ten years ago, I experienced similar symptoms.  Pains in the rectum and nether regions and crippling pain down below when enjaculating. I was diagnosed  with prostatitis and prescribed Tamulosin, which I was still taking until a year ago.
Despite the similarity of our symptons, I'm not medically qualified, so I suggest you get a doctor to check it out.
However, like many on here,  I can categorically state, that the prostate gland can definitely be an absolute pain in the a*s*!  🙂
 
Edited by member 15 Nov 2023 at 19:20
 | Reason: Typo and additional text