I'm not quite sure if my symptoms are actually caused by an allergy, as I don't have sneezing, itchy watery eyes or a runny nose, but I do have chronic head congestion and my ears clog up whenever I'd lay down. I'd have a chronic cough from the back of my throat, that I thought may be post nasal drip and sort of a wheeze on exhalation. This has been going on since last Autumn, so that's why I didn't think it's a seasonal allergy. Anyway, I've tried all of the over the counter allergy meds such as Zyrtec, Loratadine and Benedryl and they didn't really help much, plus they left me feeling tired....