Hi Kathy
Sorry to hear you have had such a lot of problems over the years. I also have reached 40 with no kids and am scheduled for surgery this Tuesday for a TAH. I think that, like you, having had problems getting worse since puberty, my body is ready to "hopefully" get rid of all this pain. It is a very drastic solution though so all other therapies need to be tried or discounted.
I guess you need to discuss with your docs the pros and cons and whether or not a hysterectomy is a worthwhile cancer preventative measure for you to take. Some cancers are slow growing and where there is a family history you can be monitored more regularly and then perhaps have the hysterectomy if you show early signs of the disease.
As to the mechanics afterwards for bedroom activities, I will let you know

but I understand that whilst most women feel liberated and enjoy it more , there are some women who find things different and sometimes worse. I think it will depend on how good your surgeon is, how much is taken away and how fit you are leading up to surgery. If the cervix is also taken (which is the bottom part of the uterus) they have to move the bladder and this increases the level of risk.
Hope this all helps
regards
ktee