I HAVE A HORRIBLE PAIN ON THE LOWER LEFT, GUESS PELVIC AREA...IT STARTS THE LAST DAY OF MY PERIOD & CAN LAST UP TO A WEEK, SOMETIMES IT CAN CAUSE PAIN IN MY THIGH...THIS IS STRANGE BECAUSE I DON'T HAVE A LEFT OVARY, IT WAS TAKEN ABOUT A YEAR AGO DUE TO DERMOID CYST...ANY IDEAS WHAT THE PAIN COULD BE???