Scooby. My story is very similar to yours. I have Endo, IBS, and Interstitial Cystitis. I was taking a lot more then you, and I did the taper. I was also coming off of Morphine ER. I cut that out completely. Went from 10-12 sometimes up to 20 a day of Oxycodone 10/325. I cut down to 4... I went through some withdrawal, but it wasn't nearly as bad as withdrawal I've had in the past.... I wish you luck..
I still have pain every day, but I hope that eventually it will go away. I'm thinking of just doing the hysterectomy even though I'm only 27.. My sister had one last year, and she said it has helped a lot...
Good luck! Keep posting here...