I need help

Hi, I'm really worried about my cat. She is just lying on my floor breathing very heavy and she has her mouth open with her tongue kind of hanging out and she never sticks our her tongue like that. She also pooped in the middle of the floor which is so unlike her. She has been trying to cough up a hairball for the last couple of days and I don't know if that has something to do with it but you can tell by looking into her eyes she is in pain. Its late and there are no vets open and I don't know what to do? Anybody know?