I also have Carafate suspension and keep a supply at all times because I have a very reactive stomach and it gets irritated easily. Carafate has no antacid properties, but instead, coats the esophagus and stomach to make them less likely to be damaged by acid.
There would be no reason to stop it, except when it gets close to the procedure date. Carafate suspension coats and lasts for about 6 hours, so you'll want to stop taking it in time to keep the coating from interfering with visual imaging of your esophageal and stomach tissue.
I'd suggest that you call your doctor's office and get their advice as to how to handle your discomfort as you prepare for you testing. You don't want to do anything that would interfere with the testing. The GI doc will give you the exact information you need. As I said, he'll probably give you permission to use it for a while.
I'm surprised they didn't give you a sheet with directions as to when you can take antacids prior to your procedure. I know you can take Zantac longer than PPIs, and Maalox even longer than that. Still, to get the exact timing, please call your GI office.
Good luck with your testing!
Words of wisdom by Eckhart Tolle:
"Whatever you fight, you strengthen, and what you resist, persists.”
“Worry pretends to be necessary but serves no useful purpose”
“Accept - then act. Whatever the present moment contains, accept it as if you had chosen it. Always work with it, not against it.”