>>13323617a massive dose of vitamin-c
Eat several oranges and drink a shitload of orange juice
You'll need to cut that with some carbs, so eat some good bread.
Blow your nose tf out
Then take a single dose of loratadine or 100-150mg of diphenhydramine.
Eat a grapefruit or drink some grapefruit juice if you want to speed things up for the anti-histamines.
(Grapefruit takes up the enzymes in your liver that would normally break those active ingredients down, so you'll get more into your blood stream faster.)