I had a long response, but for some reason it didn't get posted. I'll try again later.

I'll do some short responses one topic at a time since my other long response didn't go through.

As luftmensh1 mentioned, the urodynamics wasn't painful, just uncomfortable. They fill your bladder with water to see how it responds to different circumstances. If you can't hold it, a bowl catches the water (urine). They're really testing your bladder, and not really directly related to a prolapse. Any tweaking of the bladder can be performed at the time of surgery.

I'm sure your doctor will prescribe appropriate pain medication as needed after your surgery. As the medical professionals always say, take them in the intervals advised (meaning don't stretch out the time for your next dose), especially knowing your pain tolerance. This should ease your pain. They will also prescribe stool softeners if you need them. Be sure to eat foods high in fiber and drink lots of water and other liquids. I drink a lot of tea.

The vagina is shortened and sewed up on both ends to hold the bladder and uterus up. Very slim chance of any future prolapse, as studies have shown.