Always nauseous

Okay so no I’m not pregnant but I am always feeling very nauseous, it’s mostly only at night , I’m not pregnant but sometimes I’m so nauseous I just eat one time a day and at night I’ll just go to sleep and durning the day I’m fine. Idk if I need like more water or something but I don’t really have health insurance right now for a doctor so I’m trying to just see if anyone knows anything that helps .?? Peppermint gum helps a lot .! But I can’t keep going on with this nauseous