Consistently Nauseous???

Every night, between 8:30-11, I get so nauseous to the point that I am dry heaving. It only happens at night & is even worse if i try and lay flat. It has been going on for the past 3-4 weeks, has anyone else had something like this??? I am not pregnant and do not have any health issues. I am SOOOO tired of going through this. It has me wore the hell out.