I have come to believe I have Endometriosis. Ladies, do you have any advice to ease my pain?

I've been well aware something has been wrong ever since I had started my period ~9 years ago. I bleed uncontrollably for 8-15 days, and I can't even begin to explain the pain I feel. I have extreme pain in my hips and back, sometimes below my stomach.

Over the years I have become more immune to the pain, but for a day or two I'm still knocked on my ass from it. There are days that the pain is so intense I can't stand upright. I hate telling others about it, it makes me feel weak and I know they won't understand.

I have a doctor's appointment next week (I've been waiting four months to get in) and hopefully get a real answer, or even better, something to help.

So tell me, TwoX, do any of you have this ailment? If so, are there things that will help? Anything will be appreciated at this point.