Nyquil, during the day... I have bad allergies too. I assume you're talking about hayfever.

A few times a year I get a BAD storm of allergies which makes me go through a whole box of tissues. That's when you gotta hit nyquil during the day. It'll make you tired, so drink coffee. The idea is, your hystamine reaction has gone absolutely crazy and those mainenance medicines won't do the job. You need heavy duty antihystamine medicine to reign in the outta control stuff. Take a long steamy shower to clean out your nose. All the allergens are stuck in the mucus of the haird of your nostrils. Get it out.