Endometrial Cysts and PCOS

I am 26 and have a 4 year old daughter, she was a suprise to us both but now my fiance and I have been trying for a second baby we are failing at every step. I have been diagnosed with PCOS and Endometriosis. At the beginning of the year I was rushed into hospital to have what was thought to be a large ovarian cyst removed, although it turned out to be an Endometrial Cyst (Chocolate Cyst) that had attatched to my bladder, bowel,intestine and uterus.
The months following the operation were pain free, but now midway through my cycle I am in constant pain only relieved with pain killers. The doctors have said pregnency is still possible but after trying for so long with no results I begin to dread the start of my period because I know its another month to wait for a much wanted addition to the family. Has anyone else had this problem? I would like to think there is a chance before I finally have to sucumb to a dreaded hysterectomy before I am 30.