Sudden allergy to sugar after taking neurontin

Patient: I was on neurontin for 3 days, broke out in hives, stopped taking it.. and a year and half later, my body is still itching. when i consume no refined sugars, the itching almost stops; when i consume refined sugars, the itching is so bad i could cry. is there any connection between the neurontin allergy and the sudden sugar allergy?