How random can food allergy reaction be?recently told have allergy to some nuts. hives once.history of vagus nerve symptoms resuming in minutes on own

Ask your DR(S): Allergy to 1 nut usually includes all nuts. If you react once, you will react the same way every time. You question is too vague for an answer here. Spend some quality time with your dr. Write down your questions so you don't forget.

New oral vaccine: There's a new oral vaccine close to being marketed for peanut allergies. Ask your doctor about it if that's one the nuts you may be allergic to. I don't understand what the question is but if you mean that sometimes you have allergic reactions and sometimes not to the same food item then, this is difficult to explain. An allergist or immunologist would be your best consultant for this problem.

Depends: Incidence of nut allergy is around 1%. People with atopic dermatitis are more likely to develop food allergy via skin contact. Remember that a positive skin or blood test does not prove food allergy- just a potential . You must have symptoms from eating the food. People allergic to one nut is more likely allergic to another but they are not related. See an allergist.