Crytal,
I'm sure about your questions about scar tissue, but my mother had to have a complete hysterectomy because her uterus detached from the uterine wall. Her uterus would move around and hit a nerve in her back and make her drop to her knees at any given time during the day. The pain was so immense for her that she stopped going anywhere, she didn't even want to leave the house to get groceries - so like in your case, she didn't really have a choice. It was either live with the pain or have the hysterectomy.
Well, even though she was in her 50's at the time she hadn't started menopause yet. After the hysterectomy she was thrown into menopause - no gradual process that most women experience. So you will have all the effects of menopause as a side effect of the hysterectomy. Make sure that you talk to your doctor about hormone replacements now so that you can find the right dosages of whatever you decide to take. It took my mom awhile to find the right dosage. She would feel dizzy from what she took and then stop taking it and then have the sever mood swings and hot flashes so start taking it again, until I told her to talk to her doctor to get it under control (my mom's a little bit stubborn :)
None of the menopausal side effects are necessarily bad, you just need to be aware of them so that you are not surprised by them. Also so you are taking active steps to control them.
Take care and God bless,
Mel