Hi, I have Endremetriosis, was diagonosied with it last Feb after an operation, after having extreme pain every month and really heavy periods. Over last 3/4 months my left Ovary I think feels like It Is swollen and causes me severe pain when walking, standing and especially when sitting. It comes usually every month before I am due on. I get throbing pain down my left leg. When I am sitting If feels like It Is swollen. Would It be that I have a Cyst on my Ovary?