It is really annoying, basically, whenever I eat something I am not familiar with, or has a strong taste/texture, I think I am having an allergic reaction, and have to control panicking, or in the case of meat/eggs, I am convinced I have food poisoning, and feel really scared for 4 hours. It doesnt matter how many times I eat the food, I still cannot convince myself that I am not allergic, even if I used to eat it daily.
It started because I had PTSD, which came out as a severe anxiety disorder (I got diagnosed after I had psychosomatic bleeding from my kidneys on and off for a year, along with random panic attacks (not hyperventilating, but I would go into complete shock, shivering, getting nerve twitches all over my body, feeling like I was passing out, for about 4 hours at a time), I got this under control, then suddenly I got scared of eating eggs after someone made a comment about "Oh, did you know, people die from salmonella cos they dont wash their hands after touching eggs"
After that it just grew and grew, been trying to work on this (first chemically, through SSRIs for 2 years), and now through weekly therapy and outpatient treatment at an eating disorder clinic. Initially the food wasnt the main issue, I was hardly eating because I was constantly having adrenaline rushes from anxiety.
We have found that the underlying issue is that for some reason, I do not get hungry, I get signals of hunger as feelings of panic, they say this is because I do not notice hunger, until my blood sugar drops, then I get panicky feelings, and the classic low blood sugar shakes etc, and when I eat something, I associate that with the panicky feelings as I cannot find any other reason for the panic.
We are working on this by getting me to eat every 2 hours, just a banana or a slice of bread, this has made a huge difference, now, if I am having a day when I have managed to eat small quantities regularly, I decide to have a proper meal, unfortunately, usually at some point in it, I suddenly think "How do you know you are not allergic", which can trigger the whole thing off again.
I am not sure if the disorder has a name, but the hospital say it is a combination of PTSD and a severe anxiety disorder which has transferred to eating, so they are treating all three at once. Social eating is a major trigger, which really messes up eating at university, or going away on residential field courses.