So I started using a menstrual cup around 3/4 years ago. Absolutely loved it, had no problems.
Maybe a couple of years later my boyfriend and I were out one day, walking quite a lot, and something didn't feel right. I was on my period (using a menstrual cup) but I couldn't really explain the feeling. It was almost like faint period pains but different. I just tried to walk it off and get over it, but by the time I got back to the car I was doubled over in pain. It felt like a hot poker dragging something in my vagina, I couldn't sit properly. The pains kept coming in waves, slowly lessening, but by the evening I felt like i'd been beaten up. I had to take the next day off work.
I went to the doctor who referred me to a gynaecologist who I saw a month or so later. NOTE I'd had another painful episode but was not on my period at the time. Had scans on my ovaries, bladder and kidneys and everything came back clear. The gynaecologist said it was likely endometriosis and that I should get the coil. This didn't really add up to me as I didn't have any of the other symptoms like heavy periods, excessive hair growth etc. Left crying, refusing to be put on hormones again, as i'd had such a bad time with them in the past.
I basically gave up with going to the doctor because I didn't feel like I was being listened to. I knew something wasn't right. Googled a lot. Had ruled basically everything out. I decided to stop using my cup and i've not had a really bad attack since, I do still have little flutters of a feeling every now and then though.
Fast forward to now and that article comes out about cups causing prolapse. I'm 100% convinced this is what happened to me. I would not wish the pain I experienced on anyone, because it was honestly the worst pain i've ever been in. There should be much more testing on them for sure. I certainly won't be using one again.