Is it normal that i throw up every so often?

So I got sick a while back. I threw up, and I thought I just caught some virus going around..and a day later I felt better. So I ate what I usually eat, which actually isn't a lot, just about two meals. But the next day I threw ALL OF IT up. I didn't hold any of it down. Its been two days, and even as I type this, I feel like I'm gonna throw it all up again. I've also felt really tired lately.. Is this normal? Should I be worried? I don't wanna go to the hospital, as my mother lost her life there about a month ago..but I don't know what to do.