What's wrong with me?

So lately... I haven't been feeling my usual self. Like somethings off.  Every time I eat I don't feel good. Like throwing it up or something. But then when I do eat.. I end up not eating a lot. Like maybe a couple bites of everything and then I'm done. Or when I do get hungry, and I smell something delicious, I get full already. And I space off a lot more than usual.