You mention that you are still in a lot of pain, but don't mention where that pain is, how long you've had it, etc.
When you had the STI testing and PID testing, did the do anything internal, like a swab test or a pelvic exam? Did you bleed after those?
I just did a quick google for "bleeding after orgasm no penetration" and quite a few results came up with endometriosis. They were anecdotal, on reddit and such, but I also found this on our site - https://
www.medhelp.org/posts/Polycystic-Ovarian-Syndrome-PCOS/Bleeding-after-orgasm-NO-PENETRATION/show/1968783
Many results also mention being on birth control pills or the Depo shot, or other hormonal birth control methods.
Depending on the pain you are having, endometriosis may account for this, but definitely talk to your doctor.