When I was going through my problems with swallowing, I suspected the cause was the Fosamax I had been taking as I knew some people had this type of reaction to it; that's why you were supposed to remain upright for at least 30 minutes after taking the pill first thing in the morning. This cause was never confirmed however. I, too, drank the barium while the doctor watched on the monitor, and he told me the suspected problem immediately.

When tracking the daily/weekly episodes, it would probably be a good idea to keep track of the medications you're taking at the same time, for future reference.