We had meatball subs.
Check those. Subway? Someone else?
What else is prepared on-site?
Home-made? Where did the meatballs and bread come from?
honestly-- your spt results do
not sound that impressive. While this is certainly possible-- and even
likely, if you were still on any antihistamines within a week of the test-- I might be keeping a careful food diary for now.
Sesame is a not-infrequent adult-onset allergen. It's
beastly in terms of avoidance, and many, many, many times, it can
seem like allergies to a LOT of different things because it is just present in
so many different items.
What history do you have of eating sesame-- just curious. The reason is that if you
are allergic to sesame, it's
possible that your actual allergies are rather more limited than that long list of tree nuts (which, if I've read you correctly, you have history only to walnut). Walnut
seems (just anecdotally) not to 'pair' necessarily with other tree nut allergies. It can truly just be a single, and at this point I might well suspect that if you've got a lot of history of eating other tree nuts. I mean,
for now, not something to fool around with. Obviously.
But if your allergies were to walnut + sesame, then everything makes sense.
I know that Silver had an awful time until she and her doctor figured out that she has a sesame allergy-- it seemed like she was becoming allergic to
everything. That can be really, really frightening.
Mostly that isn't the case, either-- it's mostly that you have to figure out just WHAT thing is the allergen.