Heh, I get that too when dealing with different doctors for the same problem. They ask me what's the deal with some thing that I wouldn't know and it's like I don't really understand, why don't you ask the other doctor? ;)
If it makes you feel any better, I had almost the exact same thing happen to me. I had all sorts of girly pain and severe bleeding each month as soon as I was old enough to get it and they told me I'm just unlucky. When I would have pain in that area outside of that time of the month they would tell me it was a cyst and I'll feel better after it bursts. Not that they actually bothered to do any diagnostic tests, they just said it was a cyst and it'd go away and apparently I get cysts often and they burst. Not so. Turns out I had a huge giant fibroid tumor that was causing all the pain and bleeding. I also had what they thought was a complex cyst, which turned out to be my poor ovary that had mutated into a giant non-cancerous tumor. Since I had been blown off all the time for my symptoms they literally had no idea what was inside me until those things were squishing me so much that I was having trouble breathing and my blood pressure, normally 120/70 was constantly 147/121 and my pulse, normally about 85, was constantly 150. Then they found those fun things and were like wow you need surgery.
I know the non-laproscopic surgery sounds scary, but if you have ever had a c-section that's pretty much what it is. I haven't ever had children but they told me that's basically the type of incision they did for me. My tumors was so large that I literally looked like a pregnant lady all the time despite only weighing about 100 pounds. I was happy to learn that I had not gotten incurably fat from prednisone, and I look much better now since I'm not stuffed with tumors. They only had to make a cut about 7 inches across on me to get those big huge things out, and it was actually the least painful surgical recovery I have ever had. I felt much better literally as soon as I woke up from all the anesthetics. I didn't even need painkillers, just ice sometimes. It's not a very bad surgery at all, they make it sound so terrible but it's really easy and relatively painless. All my girly related problems are completely gone now too, except for when stuff kind of acts funny when I'm on prednisone.
Good luck in your surgery! I hope I have helped you be less worried, and I hope you feel lots better soon