LICE PROBLEM! PLEASE HELP!?

My mom just found lice in my hair! It's not at the top of my head but at the bottom behind my neck. It's too late to go to the store to get the product but is there anything i can do over the night to make it better. Im just so paranoid right now! I was fine before but now i feel as if there's things crawling around my head. PLEASE HELP ME!