NNLM, I have had three laparoscopies (as detailed in the first post on this thread).
FOr me, it was only surgery that worked - the diagnostic lap did nothing to treat me, and a year on, the pain was crippling (literally couldn't walk and spent most of the day in agony ). My joints flared up as well, which didn't help - am sure that endometriosis is more than a gynae condition - think there's an autoimmune factor to it too.
Not sure if you're worried about fertility, or how bad your endo is, but I conceived DS on my first cycle of Clomid and am now pg again naturally - fell the first month of trying, a year almost to the day after I had DS. I also have polycystic ovarian syndrome, so to have got pg this easily has been very surprising!
My first lap was day surgery, but my blood pressure dropped so violently that they were considering whether to keep me in or not - on a trolley in A&E... Needless to say, I discharged myself!
The second time, I had an overnight stay as I went private (too painful to wait several months for an NHS operation). The third time, I had to go in the night before to, er, evacuate everything so that my bowel was clear as I had enormous amounts of adhesions (after the second operation the surgeon said he was extremely surprised by how much disease was present - said my left ovary was invisible because of the adhesions binding everything together) - basically I seem to grow endo very well
I found that my shoulders hurt after the operation the first time, but not the second and third. It's a sharp ache which makes it hard to breathe - it's caused, as St George says, by the gas they use to inflate your abdomen.
You shouldn't have big scars, but depending how much they do inside, you may be pretty sore for a while. Take the pain relief you're offered. And apparently peppermint's meant to soothe the shoulder pain - if you get it and there's a great chance you won't.
Wow, an epic! Good luck with the operation. I am sure that you will feel better after you're healed - I found it truly life-changing.