Hello Murray
and welcome!
At this point your symptoms could be related to several GI disorders, so guessing would get you no where. It sounds like your doctor is taking a fairly aggressive course of action, which in my opinion is good. My problem has been that my pcp took forever to order any test and then only reluctantly and very conservatively. It took over a year to diagnose gall stones and all that time I not her was in pain.
As to the prep: It depends on what you're taking for prep as to when the fun begins. Without knowing what you're using, I would stay fairly close to the bathroom and even closer after your first go. I used golightly for my cleansing and the first BM happened after about 45min. My used some pills (visacol i think it was) for hers and she didn't go for a couple of hours. I definenatly would plan on staying Home once you start. All that pooing is going to make you tired
for one thing and you won't want to get very far from the toilet for another. All-in-all though it's not that bad. Some folks do have a hard time keeping the their med down (sicking up if you know what I mean), hope you're not one of them, but keep an empty waste can at hand, just in case.
When you get to the hospital they will put an IV in your arm and give you your nighty night meds (they usually use two) through the IV and your asleep before you even know it. They'll tell you they're going to give you something to relax you and something to put you to sleep
and the next thing you know you're coming to in recovery. they'll make sure you've stable legs under you, let you get dressed, take your vitals on more time and send you home. While you're recovering the dr will most likely come out and fill-in whoever is accompanying you on what they found and what kind of post procedure care you'll need that day.
The worst part of the whole thing is the prep. You feel like you're married to the toilet for the evening. The tests themselves will go just great and hopefully they'll find out whats up with just those two test. LOL!
Keep us posted on whats going on!
*I'm new and need words of wisdom and strength 
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