i recommend that you see an allergist to fully evaluate these episodes. bring with you a list of all foods consumed on the days that you experienced adverse reactions. sometimes these reactions can be random but other are linked to foods. food allergy typically occurs with each exposure and can present as itching hives lip/tongue swelling nausea vomiting or passing out. food allergy reactions can be severe. there are rare forms of food allergy that only occur with the combination of eating and exercise. the allergist can help evaluate these and give you instructions in regards to your diet timing of exercise and likely administer an epi pen.
i had strong allergic reactions twice after eating shellfish and then fish when i was physically active. why is that?