March 26? You've had a loooong wait for this. I'm glad it's finally scheduled. The prep is not exactly fun. Here too there's a day on clear liquids then day 2 you add in the saltwater-and-laxative treatment, and then on day 3 when you're totally drained and dehydrated you eat and drink nothing until after the exam (which is not too bad if you're first on the morning schedule, but if you're last in the afternoon you're pretty much wasted). But that's all about visibility in there, so not much you can do about it. The exam itself is not so bad, given that they sedate you pretty well. And after it's over then at least they know what's going on. For pretty much anything they find there are now effective treatments, even for colon cancer if it's caught before it spreads. Survival rates are up around 80% last I heard (and that was years ago).
Fingers crossed for you guys. Hopefully all will be well once the end's well.