Diane, if you wanted to test this, you could eat the sandwich filling without the bread (and have something else for your carb, like rice or potatoes), or you could try a sandwich on gluten-free bread. That would give you more information about whether it's the wheat.
Allison

: I've noticed after I eat a sandwich I
: feel like crying and I get sad.I
: suppose it might be the inside of
: the sandwich too.I usually don't
: eat much bread.