What can I expect after a hysterectomy?

Finally having a hysterectomy to relieve pain of endometriosis. I have tried every other treatment, gone to other doctors, and have not responded to anything. I am tired of surgeries, tests, medicine, therapy, etc. I am 21 years old, and have accepted that I will never have children. It has been hard, but I am ready. I can no longer eat, use the bathroom, sleep, have sex, exercise, NOTHING, without being in pain. It's constant, and causing severe depression because I am not able to perform daily functions that I know others do without effort. What I'm nervous for is what comes after the surgery. I've heard about weight loss and weight gain, depression, negativity, etc. Can anyone tell me a positive experience they've had with this? Every other site is so negative it's scaring me. Thanks!