What does nausea feel like?

I'm 21 and the last time I threw up was in 2nd grade, I haven't since then! (I don't really drink or anything so that may be why). But I always get the feeling of nausea confused with other things because I haven't felt true sick nausea for so many years- what does it feel like? Do you feel it in your stomach or your throat? Sometimes I get a strange feeling in my throats even if my stomach feels fine, so I don't know if that's nausea or not?