CT for diagnosis?

Has anyone had a barium contrast CT to diagnose digestive problems?  I have one scheduled today, but i really think it is more hiatal hernia or ulcer related.  My upper middle stomach is tender, as well as my bowels. 
 
Thanks in advance for reading and responding.   I really appreciate it. :-)
I've been blessed with the opportunity to have a barium enema a year and a half ago. 
 
Don't know if what you're scheduled for is similar, but just the upper GI tract.  If it is, I guess they give you some barium junk to drink and then X-ray your digestive tract.  Think the stuff is nasty but if helps them see what's going on, it's worth it. 


Hayley