What can stop a runny nose in minutes?

I am suffering from an extreme case of a runny nose. I just survived what I think of a mild version of a flu and now my nose is super runny. If I reach down to my feet, watery snot pours out of my nose. I'm a little congested but its bothering me a lot. Even when I tie my shoes, my nose starts dripping like crazy. This has never ever happened to me. I tried blowing my nose and it just comes back. Should I dehydrate myself. Help!