Note what you are eating.   Keep a list.   Try to eat your favorite foods individually and wait for a reaction.  I'll usually get the itchy ears within 5 to 10 minutes after my sensitive foods.  Take a rast test to see if your Doc can catch the obvious sensitivities.  You are not necessarily allergic you are sensitive to certain foods.  This is a difference of degree but is important to know regardless because even a sensitivity can take a toll on your overall health.   It will drag down your energy... our concentration and your overall drive.   Some people go a lifetime with these and just think it is normal.   It isn't.   And if your getting that itch inside your ears after every time you eat a certain food that is useful feedback.   Your inner ears are like the canary in the mine.  The sensitivity of the inner ears is heightened above other organs.   So listen and feel ... you're getting important information.   Read up on Food Sensitivity and OAS.... Oral Allergy Syndrome.   You'll get a part of your life back.