I've had three kids, and things are prolapsing all over the place! I don't have bladder issues, but because we can be frank here and it was such a huge help to me, I'll pass on something that my mom passed on to me that has been an immense help :

(yucky medical details warning!)

My mom and I both sometimes have problems passing a bowel movement, because sometimes the poop prolapsed down into the vagina. I thought that it was merely constipation sometimes, but my mom passed on the little trick and it worked like a charm; I hadn't realized that it was hard because the poop had moved down and away from the opening. What you do is sit on the toilet, lean forward and insert your thumb into your vagina and gently push the poop up back into place, all nicely lined up and headed for the exit and a watery grave. Sometimes it has to go just a TINY bit backwards if it's stuck in a pocket.

I don't have to use this often, but it's a real lifesaver when I need it. I used to just strain and strain and not realize that the poop had dropped down into a little pocket and couldn't go anywhere.