I was eating nachos and I swallowed a big piece and as it went down it hurt and now every time I take a deep breath It feels like the chip is still their what should I do

Have you tried drinking water? Try to moisten the chip so that it will go down. If the pain continues after that you might need medical attention.

Drink lots of water and try swallowing soft foods like rice to try and make it go down.
If its still hurts and is uncomfortable, you should go see a doctor.