Be VERY glad he doesn't want you to do the gallon - I don't know how anyone could get through that!!!! I started out trying to do that and was VERY nausous. She finally switched me to the fleet - but I only had to do it twice, once before bed, and then she woke me up to do it at like 5 in the morning. It's so small you can chug it in 2 gulps...just PLUG YOUR NOSE and don't unplug it until you wash it out with water or juice or something.
You know how nausous I get, and I didn't throw up from the prep at all!!!
I'm really glad you're getting it done! And YAY for good doctors!