Everything. :'(
Tree pollen, cats, bee stings, all nuts (particularly pistachio and cashew, which the allergy specialist said I had the worst reaction to he had ever seen when I was tested), strawberries, sesame, paprika, avocado, courgette... and a load of other random things that will take too long to list.
Nuts are the worst one. Nuts will cause my throat to swell up so that I can't breathe within under a minute (from experience). The other food allergies, at the moment, will make my mouse tingle/swell but I can control them... but I obviously am not going to test it because with more exposure, the worse they get. I carry an epipen.
I am a JOY to feed. My allergies mean I can't eat so many things, largely because of the sesame allergy!