Hi... Welcome to HEALTHCARE MAGIC.. I have gone through your query and can understand your concerns... As per your complain itching in throat after eating certain foods is an indication of allergic reaction and come under the category of Food Allergies.. Allergies to sea food is a common finding and is seen in many individuals.. You should consult an Allergist and get evaluated and he can advise you to get food challenge test and RAST test done to rule out for allergies and avoid eating those foods for relief.. To reduce the severity of the allergic symptoms an Immunotherapy can be given.. As of now you can take anti allergics like diphenhydramine (Benadryl) or Fexofenadine (Allegra) for relief from allergy symptoms.. Hope this information helps.. Thanks and regards. Dr.Honey Nandwani Arora.