Always nauseous!

So just to set the record straight, I am NOT pregnant.

I feel like I’m always battling nausea. Mostly at night when I’m laying in bed, but sometimes it pops up during the day too. I never vomit, I just get super upset stomach and then have to drink either ginger tea or ginger ale. It usually subsided but I’m so tired of living like this cause I’m not eating the amount I should be either. I’ve tried activia yogurt and it made things a LITTLE better but not much. Anyone else experience this? I’m only 21 so I highly doubt it’s any kind of ulcer.