Last week whilst on a night shift at work I was on my break lying down and I got the most intense stabbing pain in rectum that lasted about 10 mins. It took my breath away and I wanted to cry it was so bad. I went to the loo thinking I needed to poo but nothing there. The pain went but still felt aches. 2 days later I got a discharge brownish/black sludge. I thought it was a period. Though I have the Mirena and don't get periods. Since then I've had awful period like pain that spreads to back passage. Cramping and feeling there is something in rectum. I'm wondering if the Proctalgia spasm has displaced my mirena. I thought I could feel something plastic like on examination it doesn't feel like threads. Pain is not going away. I phoned 111 and they said I probably need a scan. Not phoned GP yet due to dread of phone queue. Any thoughts/advice/experience of this? I'd be very grateful. I'm age 50. Also on HRT.