I do react a bit to beer, but I eat bread daily without any trouble that I've noticed. So I doubt it's gluten unless a gluten insensitivity can vary a lot. I'll keep it in mind, though, thanks.

Vinegar is a good point. At home we use balsamico 95% of the time, but at work it could be wine vinegar.

(Just fell for the temptation to add a little cream (leftover from baking) to a milk-free hot chocolate mix two hours ago, and am still regretting it. Blorp. But no thick throat though.)