A food allergy is an abnormal reaction of your immune system to a food.
In the case of an allergic reaction, the symptoms usually occur within several minutes to two hours after eating the food. Symptoms range from skin rash and facial swelling to more severe reactions such as severe vomiting and diarrhoea, shortness of breath or even loss of consciousness.
Some doctors perform IgG tests to diagnose food intolerances/food allergies. The presence of IgG antibodies is NO evidence of an allergy or intolerance. There is therefore no scientific evidence for changing your diet based on anti-food IgG antibodies that were detected in your blood.
Pain (headache, muscle and joint pain) and continuous itching are also not suggestive of a food allergy.
Your doctor will discuss the treatment options with you.