Hugs...im sorry you are in pain
It does indeed sound like a sciatic nerve thing...you may have twisted or strained to hard trying to force the orgasm.
If the pain does not get better soon......i would highly suggest seeing a doctor...even if all he says is the same them you see here....
Is it possible to have a forced orgasm with no stimulation?.....simple answer...yes.
You may come to a point that you will come on command.......