I've often experienced the same feeling after meals. In fact, I used to have a really terrible fullness in the left side of my chest after I ate a meal, no matter how small or big (though it did increase in severity with the size of the meal).
Anyway, I recently learned that your stomach is on the left side, which would coincide with my full feeling, and the anxiety I experienced because of it.
Since then, the anxiety after a meal has decreased by about 80%, but I also have to mention that I have stopped eating all white crap (white bread, rice, pasta) as well as other bad carbs like potatoes.
I'm currently taking Celexa, and even though it's helped with my general panic and anxiety, it never had any effect on the after meal problem. The only thing that worked was a change in diet, and understanding that the full feeling was cause by my stomach, and had nothing to do with my heart not functioning properly.
Oh, and I also wanted to mention that hypoglycemia is VERY often missed by glucose tests, as most are not done right. If you search on the net for "hypoglycemia, natural health, panic attacks" or something similar, many resources will come up on the subject.