If i snort water up my nose, will my runny nose go away?

No, it will cause your nose to become runnier due to the water making the snot wetter

The best way is to swollow and hold in your breath

You did not show us the image of the burger, but i shall try to answer as best i can.  when purchasing food, always consider the ingredients as well as the person who prepared it. consider if they were hygienic people or not, in case the burger was infected with bacteria. no mortal should place an infected burger into their mouth.