Chest pain in 23 yr old fm?

I'm am 23 years old. I had smoked on and off for 4 years. Most of the time I didn't smoke. I recently just quit. I am overweight but I've been trying to eat differently and exercise more. I've lost some weight but not enough yet. Just yesterday, around noon, I started having chest pains. At first I thought it might be heart burn or gas. But I am fairly certain that's not it now. The pain is so much worse now. I could hardly sit up this morning. It feels really tight. I feel like I can't breathe. I feel sick to my stomach and dizzy. I did not sleep well last night because of the pain. I would like to know what I should do. I'm not from the city I'm in and I have misplaced my driver's license so I can't even go to a doctor right now. I don't want to freak out or overreact to something that's probably nothing.