The Sinai study of 31 fatal/near fatal cases of food anaphylaxis is the one that found that only a minority of FATAL reactions (as opposed to non-fatal ones in the study) included cutaneous features. At meetings and such, this has apparently been borne out by wide anecdote to the point of consensus, as well.
Our allergist (who is a real research paper hound, I might add) has mentioned this particular risk factor to DD, DH, and myself repeatedly, because DD does NOT tend to present with cutaneous symptoms.
That makes delaying (er-- or hoping that someone else-- like, say, an ER doc-- will treat you appropriately?) MUCH more dangerous, because few others are likely to recognize what they are seeing as anaphylaxis. Ergo, if you don't treat properly, it's unlikely that anyone else will, either.