If you have an itchy slightly prolapsed rectum what do i do to stop the itching fast?

What you described is more suggestive of external hemorrhoids than a prolapsed rectum. Try over the counter hemorrhoid cream like Preparation H. If that does not resolve the issue, it would be prudent to see a doctor. diet: http://www.choosemyplate.gov/., exercise 30 minutes/day, drink enough water daily so your urine is mostly colorless, have safe sex, no tobacco alcohol weed or street drugs.