I've even been looking online trying to see if I could find something, and haven't seen much on prolapse other than in egg layers. I hope that everything will be fine when you get up. Sorry I couldn't help more. Good luck. Maybe, if you post on the other thread, add pictures so you can get...
You might want to post this under the emergencies/diseases category. I hope its nothing serious. Are you sure its not something from where he is still absorbing the yolk sac??