Hi Gloei,
This is so sad what has happened to you and I sympathize. I really hope you will get theraphy and maybe surgical solution to remedy the POP. It is really brave what you have done sharing your story like this and it will help many.
I didn't know that this
actually happens, I remember watching a show on TLC about unusual conditions and this woman who had had 5 children's Vaj-j was "falling out" and it happened after having her last child. She had to get surgery to fix everything and she was okay after that. I thought it was one of those 1 in a million cases thing and certainly didn't think about it again after that. I am surprised at how "common" you seem to be describing it happens.
I think midwives and doctors need to bring attention to such things especially if one is experiencing symptoms.
I had a c-section 4 months ago and my doctor brought a physical therapist the day after my op, the lady showed me how to get out bed, do exercises to my arms, legs, and abdomen(to get blood flowing and avoiding blood clots). Most importantly she showed me how to do kegel exercises/pelvic floor exercises (exactly like the ones on the youtube vid with the pillow). She didn't hold back and told me about strengthening the vaj-j for sexual activity and all that

. She came to see me everyday for the duration of my stay at the hospital.
I think all doctors and midwives should do this, make sure patients get this therapy as soon as they give birth! We cant just have such serious complictions going unspoken of when it seems they are "common". I think they owe it to us to let us know, no matter how embrassing the topic might be!