Hi, I am suffering with hayfever or allergic (not sure of that), all of a sudden it starts either in the morning or day time and it prolonged 2 days (used to stay for a day) inspite of taking certrizine for past 3 years everyday. I am really trying to understand this problem. I am on migraine meds for past 6 years and whenever this reaction starts my migraine starts. It disturbed my social and my work life. I had many cons with the GP but nobody gave me the answer or cure. I need some help please.