I've only had to deal with the PCOS and a fibroid. I couldn't imagine the pain thrown in their from the endo for you. For a year, I tried managing the fibroid with meds. Didn't work to well for me. After having a run in with a negligent ER dr, my only option was the hysterectomy. I looked like I was 10 months pregnant, the uterus was the size of one that it would've been had I been 4 months pregnant, and the fibroid was growing. Had the ER dr done a US or even a pelvic, it might have been saved by using an anti-inflammatory med. Instead, the crackhead dx-ed me with Menstrual Cramps and told me to take advil as needed for pain.
Make sure that you follow your gyn's advice on monitoring the endo and fibroid, both have a tendency to come back. And I've heard that even after a hyst, the endo may come back.
I think your best advice might come from a different sight.
www.hystersisters.com There is a sub-topic called Hysterectomy options and alternative treatments.