Toffee cushion I have the same as you, and wondered about prolapse. When I sit down if I don't get in the right position it feels like I have something 'up there' that I'm sitting on!
I had total prolapse (so I was told) from 23 up until my hysterectomy at 32, but it was the uterus/cervix that caused the most discomfort and once they were gone I didn't notice problems until recently x