I am facing extreme sneezing, running nose and sometimes headache if theres a lot of sneezing. This is happening since 2-3 years. I am taking levocetirizine for remedy twice daily (not prescribed) - even on days when I dont have the problem. Unable to understand if its some allergy, some neural problem in the nose, or anything else as not able to find the trigger. But whenever it happens, it terrible and it automatically subsides after 2-3 days. Please advise.