I had this done a few years ago. I had a prolapsed uterus which, at its worse, meant my cervix was outside my body - grim! I also had a prolapsed bladder and was developing a rectocele too. Like you, I tried a ring pessary but it didn't work in hoicking things up. Pelvic floor exercises just didn't work; for me, it wasn't a problem with my muscles, which a physio has told me are pretty strong, it's because I have crap tissue which stretches and doesn't rebound.
I had keyhole 'robotic' surgery so recovery wasn't painful at all, I was up the next day and went home. Sadly, the re-suspension didn't work for me and I had to have a hysterectomy 3 months later to resolve the issues. The mesh suspension did then help in pulling my bladder and rectum back into place, without the weight of my womb pulling things down. Basically it re-suspended my pelvic floor. My symptoms weren't worse after the first procedure, it just didn't help much in any significant way.
It's a procedure that seems ideal in theory and so I was hugely disappointed when that it didn't work. That said, the two surgeries together have sorted me out. I kept my ovaries so didn't go into menopause but tbh, I hadn't really finished with having babies (late 30s) and I felt very sad to lose my womb. However, now, my quality of life is so much better. I can completely relate to what you're saying about the 'bulge' and sex being a no-go area, it was exactly the same for me. I was also having continence problems; the bladder incontinence was just about manageable but it was the bowel problems really affected how I lived my life. It really was a grim period of my life!
Is this surgery the only option you've discussed or have you considered it alongside a hysterectomy?
I have huge sympathy for you, it's an awful condition to have to live with, particularly when your bowel becomes involved. I felt desperate at times. My bladder and rectum are prolapsing now again so god knows what I'll have to have done next time, I'll probably have metres of mesh inside me by the time I pop my clogs.
Good luck! ((unmumsnetty hug))