I'm so sorry this is happening to you.
How long ago did you have the lap done where they removed the endo?
I had severe endo and ovarian cysts for years, and sex was always painful for me, much like you describe. The birth control pill helped me some, but never really alleviated it fully, and it could hurt for hours post-orgasm, even if the orgasm was achieved without penetration.
I had a hysterectomy and for me, it was the best decision.