I too had endometriosis, had an exploratory lap at 23, a TAHBSO by 24 and it took me about 10 years to get over the psychological slam.
BUT. I had wanted children (thank God I'd given birth to one before all this came one, and adopted another soon after). No one prepared me for menopause, I didn't get the shot in surgery, nada.
Consequently, you can imagine what a joy I was to be around, and, frankly, how little joy I had in my life at that point.
That said, if you are not planning on having more children, if you want an absolute end to the pain (and I remember it well, almost 30 years later!), then the surgery is the way to go.
I will tell you that what has stayed in my memory the most clear is how little I was aware of the pain I did experience before my hysterectomy. I was up and walking around and bending over and touching my toes less than 24 hours postop (and this was in the late 70's) without pain meds! That was my clue about the degree of surgical pain relative to the degree of endometriosis pain! (My surgeon said it was because of his wonderful technique.)
Don't worry, you can still have multiple menopauses! Just go and off hormone replacement! (Something else nobody told me, that I had to learn for myself.)
The only thing I can offer is, I did read somewhere that endometriosis is highly correlated with high achievement and high intellect (no sure what causes what, but who cares? bask!

), and you are certainly not alone.
My hat is off to your OBGYN who would only do the surgery with hesitation. So often they are in such an all fired hurry to get you in there and get that bill submitted to the HMO, they forget you are in charge of your own health.
Good luck to you, your sister in endo!