Nighttime Nausea

About an hour ago, I was just about to doze off to sleep when my heart started racing and I opened my eyes and the room was spinning and my tummy was making ugly noises so I ran to the bathroom and threw up. I still feel nauseas and my stomach still feels funny (like that awkward full feeling you get in your stomach right before you vomit) and I put my hair in a bun just in case I have to run to the bathroom and throw up again. I don't recall eating anything rancid or expired so I'm not sure if it's food poisoning. I really hope it's not early signs of the flu because I haven't gotten my shot yet and can't afford to take that much time off of work. What could it be and how can I shake the nauseas feeling?!