Usually the colonoscopy is the definitive test AFTER the barium x-ray, but I guess the MD is just covering all bases. You can't have TOO much information (especially not at THESE prices
Barium enema is a cakewalk. They's chat about the weather, stick it in, ask you to smile so they get a nice pic and that's about it!
The cleansing purgative the day before is the REAL chore, but then you KNOW that from the annual coloscopies (a GOOD idea.)
Make sure you take the recommended laxative/stool softener afterwards to make sure you get all the barium out before it has to be chiseled out<just joking>.
I had an upper GI and nobody told me to take the softener...well I was plugged for over a week!