Sorry to hear you're in so much pain. I've never asked for any prescription painkillers for my endo pain (figured I'd be turned away after all the Drs telling me it was "normal"), so I've never tried any of those. I did try panadeine forte once because I had some left over from a prescription, but it didn't help. I hope the endone brings you some relief.

As for your other options, they sound like choices that should be carefully and thoroughly discussed with your Dr. I'd probably even want a second opinion before proceeding with the hysterectomy just to make doubly sure since it's such a drastic measure. I know it's where a lot of endo women end up though.