Hi,       allergy to foods  means your immune system becomes hyperactive when you consume the foods which are allergic to you. first thing is avoid foods which are allergic to you. second is allergy specialists are there . you contact  them , they will do test for all the foods and they will diagnose for which substance you are allergic and they will give treatment for that substance (immunotherapy.) the test called as patch test. treatment is also not costly.  but you have take for 2 to 3 years. once a week . first you consult dermatologist they will suggest where to go. and daily 30 minute exercise will help you .