PCOS and the Mirena Coil - Advice/Help Needed!

Hi everyone, Almost a year ago I began having trouble with my periods, after half a year on Norethisterone, I saw a Gynaecologist who seconded my GPS opinion that I have PCOS and gave me a few options to stop the severe non stop heavy bleeding and clotting I was suffering with - the Mirena Coil. I had it fitted in late March this year. It stopped the heavy bleeding and pain, but I did have spotting every day until about a month ago. I was so happy! But last week I had what seemed to be a normal period, light to medium bleeding but the pain was really really bad. Its now day 10 of the period and still bleeding/spotting and in a lot of pain. Today I passed a few large clots and suffered with such pain I couldn't move from the fetal position for a good half an hour. I plan to call the doc tomorrow, but wondered if anyone has been through the same thing? I almost feel like the pain either my left or right ovary, where I imagine them to be anyway! really sharp pain, together with the regular cramping. I'm really concerned about Endometriosis, which I have voiced to doctors but they've refused to do a lap for this because of my age (28), despite it running in the family. Any help would be appreciated. thanks! Jayne x