All I know is don't trust doctors. I had a laparoscopy a few years back to diagnose endometriosis (which I've had since 13 years old, caused excruciating pain, and doctors always told my parents I was faking it to get out of school). After the procedure, they almost discharged me, but my dad was worried I couldn't drink anything. I went through multiple cat scans and MRIs over 2 days before they found out they had put a whole in my intestine. I went into emergency surgery at midnight on a Saturday, by then I was very very sick.
After all of that, I was getting excruciating pain in my abdomen (worse than the endometriosis). I had to be hospitalized for pain every 3 months for over a year and a half (for 4 days average on morphine, and it would take me weeks to recover). I was sent to every specialist in the book. A GI doctor prescribed me anti-depressants saying it was all in my head (sound familiar?). Every test I've had has been inconclusive (still to-date). Some things they just cannot diagnose conclusively, but they are pretty sure it is adhesions (a common complication from surgery in the abdominal area, that cause my intestines to twist on themselves - this may be something you think about).
After a lot of pushing, I was finally able to see a pain management doctor, and only get episodes about once a year. I carry morphine on me at all times, and things have gotten a lot better.
All this is to tell you that doctors make a lot of mistakes. Doctors focus a lot on diagnosing the problem and not managing symptoms (something you may want to think about). Also, they think that girls, especially young, can be hysterical or something (I highly recommend going to female doctors now, although there are the odd good men) Also, sometimes the stress from it can really aggravate your problems (I did go on anti-depressants for a while, and I am off now). The stress from not knowing when it will hurt next can make it worse. Good luck!