Oh Donna, I feel your pain...literally. I just had one done last week

Luckily my prep wasn't near as bad as what you have to drink. Mine was just 1.5 oz of what tasted like salt water mixed with whatever drink I chose at night, then 1 oz the next morning.

I hope your appointment is early, mine wasn't until 2:15 in the afternoon
48 hours with no food makes one hungry!

Good luck!