Hi J.. I'm so sorry you are going through this pain. When I was your age, I also developed endometriosis. Mine wasn't as severe as yours, in that I didn't have intense pain between periods. But when I did get my period, I'd have intense symptoms and pain. When I first started having these symptoms, I was told by an OB that I had a hormone imbalance and that I should take birth control pills. Luckily she also recommended the option of trying acupuncture to help.
I started going to Dr. Lifang Liang in San Francisco, via the College of Traditional Chinese Medicine where she was teaching. With her acupuncture treatments and chinese herbs, my symptoms were reduced but did not disappear. I seemed to plateau. Dr. Liang was puzzled I was at a standstill. She then wondered if I perhaps had endometriosis. While she has studied both Western and Eastern medicine, at that time she was not able to practice Western (she's from China).
Anyhow, I went to an OB who couldn't definitely say I had endometriosis without an invasive laproscopy. But she thought I probably had it. So I returned to Dr. Liang with that info and she adjusted her treatments to focus on endometriosis.
Well I must have had it and her treatments/herbs definitely worked. All my symptoms subsided and never have returned. That was over 15 years ago.
In addition to my endometriosis, I had gone to Dr. Liang for other issues like allergies, colds, etc. with great results. A friend of mine took her daughter there when she was experiencing a severe hormornal imbalance. They had great success with Dr. Liang.
I highly recommend this very sweet and caring doctor. Here's her website http://www.lifangliang.com. Her focus is on infertility, but she's trained in gynocology - Western and Eastern. She's also published a book on infertility and IVF.
I fortunately was able to quickly become pregnant with my now 4 month year old daughter. However if I ever had troubles, I wouldn't hesitate to go to her for help. Best of luck to you whatever route you take. I know some have had good results from surgery, but I've also knew a young woman who had two surgeries before age 25 and still had issues. It kept coming back :( Of course, this was over 10 years ago...so perhaps the surgical treatments are better now.
BTW: If you never have had acupuncture and have fear of needles, you should not worry. I was COMPLETELY needle-phobic (and still am in terms of blood draws or IVs, etc.). However acupuncture needles are very very thin and you usually feel nothing or very little in terms of the poke.