endometriosis? horrible pain

i had a miscarriage in 2011. it is my first and so far only pregnancy. i lost my baby in the first trimester and we have never known why. ive always had painful periods, but for the past couple of years i feel like ive been living in a nightmare, and it just keeps getting worse. it has become regular for my cycle to be as follows: i have cramping in my uterus, lower back, and thighs that is incredibly severe for at least three weeks before finally starting my period, which is extremely irregular. more than half a dozen times, i have had this pain for two-three months without starting my period and my dr finally gives me medication to make my period start. after my period ends, the pain stops for awhile, and then i go through this all over again. i saw a new ob/gyn when we moved in august. she ordered an ultrasound, which showed an ovarian cyst. she told me she suspected i had endometriosis, and told me that i was having severe pelvic floor spasms. she started me on micronor, ordered a repeat ultrasound in a few months, and prescribed pelvic floor physical therapy.  the micronor worked- the pain finally stopped and i was thrilled! i never did the therapy because the pain stopped before my first session. the cyst is now gone, so it was probably phsyiological. on jan 10, i started cramping again. the pain had become so severe that it is completely debilitating. sometimes i cannot get up and walk to the bathroom without my husbands help. my ob/gyn told me i could get the laparoscopy or wait and try the therapy first. i didnt even have to think about it- i told her i want the surgery asap. it is scheduled for two wks from now.  the pain is so bad that if there were any possibility of pregnancy, i would be in the ER right now thinking i was having a miscarriage. my ob/gyn gave me ponstel, and i have norco from my back surgery in nov, and even on the maximum dosage of both this pain is exrcuciating. its as bad as the pain i had when i miscarried (natural, no d&c). also, even lightly touching my lower abdomen hurts really badly.  i called my ob/gyn today in desperation and asked if she would refer me to the pain management dr. she said she would only refer me if i cancelled the surgery because otherwise there would be two drs treating me at once. what?!?? i said there is no way im canceling the surgery but i am in absolute agony. she said all she would do is tell me to go to the ER, which is ridiculous. i dont know what to do. i know ive said how horrible this pain is a million times so ill stop repeating myself on that. its also horrible emotionally. i really, really need help. is what im feeling similar to what you all have experienced? how did/do you deal with it? thank you for listening.