it does NOT get worse each time. Its more a case of being alert to each reaction and the 'situation' that the ingestion happened. my son has had many, many reactions, and only 3-4 so far have been full blown anaphylaxis, he has had varying symptoms as well, some with swelling some without etc, and this is pretty much the thing for multiple allergic kids.
its important to understand what makes a mild reaction speed in to full blown anaphylaxis, and recognise which symptoms you are seeing that indicate anaphylaxis.
factors that increase severity of reaction are,
amount ingested.
poor asthma control.
a current infection or recovery after an infection /illness.
other allergens that body is not coping well with, so that would depend on time of year with hay fever, tree pollen , mold etc.
alcohol speeds up absorbtion of food, and speeds up reaction.
time of the month for woman.
put simply if i use my sons case, he has severe tree pollen allergy, has all yr dustmite, dog and cat , and mold allergy, which means if he accidently eats one of his food allergens he is much more likely to go in to a severe reaction during this period of time.
that said, a FEW people among the allergic can be more sensitive than others, and react with a higher rate of severity.
airbourne does happen, for instance my son used to get hives on exposed skin if he stood next to me in the kitchen while i fried an egg. But this was treated as mild reaction, and we simply washed his skin and gave an anti histamine.
This sort of thing happened quite frequently with his environmental allergies, however I did look at hives with ingestion carefully. small hives , small reaction, full blown body hives getting bigger are a sign of more severe reaction.
its important to try to recognise the symptoms you are seeing and think about what that might be telling you whats happening on the inside, lowering blood pressure or difficulty breathing. have a look on the anaphylaxis campaign web site for more information.
dont beat yourself up about this reaction, i have done this many times with our sons allergies, thats why we have our piriton and epi pens. accidents happen. you are on the start of a huge learning curve, and there are still more days without reactions than those with. this is an indication that you are learning to manage his allergies. So chill, you did the right thing.