I was diagnosed with endometriosis about 12 years ago now, and I too have had a similar experience with the whole 'try this' then 'try this' when one after another didn't work. I was on Depo for a while after numerous types of the pill would continuously give me headaches, so I thought I would give it a try. At first it was great, no periods, and then I had a bit of spotting, which eventually lasted as a period for over 3 months too. I have had laporoscopic surgery twice now, and am actually waiting for the date of my third go round. I have been on the Ortho Evra patch, and take it continuously so as to skip my period, and it has literally been a God send. No side effects, like I was experiencing with the pill, and Depo, and other than having to remember to switch it every week, there's nothing to it. I usually keep it going for 8 weeks, then take the week break, and restart it again, just so I don't get too built up... unfortunately that week off is awful, but while it's on, it is great! It has been the only form of birth control that has actually helped and I haven't had issues with it. Ultimately I find that having surgery is always my best fix, because my gynecologist usually removes everything he finds and 'cleans it up', and the lack of pain after all is healed is the best feeling! I'd check into surgery if I were you, as it has helped me tremendously.
Hope you can find some relief!