Pain in the pelvic region?

[Coco]

I had severe pain way down in the pelvic region. After doing an ultra sound & transvaginal scan my gynaec said
it was an ovarian cyst or endometriosis.This happened same time last year (just once ) and I am having a repeat episode now. The pain gets unbearable at times it seems as if something is twisting inside . The same tests were repeated by another gynaec and I was told the same.
This time round however the pain has been continuing since early Feb as a dull twisting sensation, getting severe (almost unbearable) during my periods. I have had my periods four since early Feb , after 18 days each time.
My doc is going on 2 months vacation and on his return he'll do a laproscopy to see what the problem is.
I wonder if there is any malignancy, would it have shown in the scans. There is no weight loss, infact I keep putting on weight. My periods have been pretty irregular for a couple of years. I am 45.