Every time I eat Paleo I get a pressure on my throat and ears, a bit
like a flu coming on.
This sounds psychological rather than physiological in that this is the first time I have heard of such a thing on this list.  I say this not so much because of your post but because I believe that most of the short term (immediate) effects ascribed to diet (except of curse to burning from hot peppers or the effects of overeating and similar indiscretions) cannot be accounted for by science.