I agree with Marie9. Definitely do your research. I've had two courses of Zoladex. Idsuffered badly with side effects with the first course but it helped with my pain. However, the second course didn't help with my pain but I took hrt and that helped the side effects.
There's a new train of thought that the GnRH analogues don't actually suppress the endo but simply help with pain management however I'm not sure how valid that is.
Everyone reacts differently to the treatment so I expect you'll hear good and bad stories. It's important to do some research and then make an informed decision.
Sorry to hear you're in so much pain though. It's not pleasant and I feel for you.
Is there any reason why you're not getting a laparoscopy to determine if you do have endo or not?