It's been a long time since I had an upper GI...from the last one I had, I have fond memories of choking down strawberry-flavored chalk. {:^x PLAIN chalk would have been preferable, at least in my case. Like they are doing us a favor, mixing in color and flavor additives.
Good thing your doctor seems both sensible and cautious, monitoring you and taking action as he is doing. Please let us know how things go -- may your happily ever after begin straight away!!!!
Love,
Lynda M. in AZ