My advice would be to get a second opinion. When I had a cyst way back when I was 24, I went to my gyn to complain about diminishing periods. Doctor was a man and said, and I quote, "you should be happy. Most women would like their periods to go away." I never went back to him. I went to a female doctor some time later who told me I had a cyst the size of an orange, and that they would use birth control pills to try and reduce it. Three months later it didn't shrink, so I had surgery. By the time they got inside the cyst was all twisted up with the ovary and they had to remove that too. They told me not to worry, that the left ovary would pick up the slack. I stayed on the pill forever to try to avoid growing another cyst. It worked. When I was 37 I decided I wanted to have a baby, so I went off the pill and got pregnant no problem.
I'm 50 now and have only had female gyns, and I swear by that strategy. I think that a male doctor just doesn't know what it's like to feel a cramp or put up with hormonal changes, or any of the things a woman feels. People have argued this point with me saying does that mean you can only have an oncologist that has had cancer, and so forth. Of course I don't believe that, but there is something about the female condition that makes me feel like I get more understanding from someone who can have the same "female" medical conditions that I do.
Get a second opinion.
I'm stepping down off my soapbox now.