Pain during orgasm

I had a laproscopy last year and last my left tube. It's been a year and I have recovered fully, but sadly can't enjoy an orgasm any more. When ever I mastrubate and about to climax I have this horrible cramp in my left abdomen. It's so severe that I am scared of mastrubating now!!! It feels like a wound is open and something strong is flowing against it... Anyone had any similar experience, esply any solutions.