With puking you really just have to wait and see!! I completely agree w shamester if you suspect you have a bacterial infection you have to go to the doctor! But you can't really know for sure if it's something serious or just a stomach bug until you've given yourself a few days to get over it. Even in my case, I could have not gone to the doctor. The next day I was much better and the day afterwards I was completely fine! There's a nasty bug going around right now so stay in bed keep cool drink water and Gatorade (you need electrolytes!!) and rest. If, after two or three days of vomiting, you feel like you're dehydrated or can't keep /anything/ down (or you're in terrible pain and can't move) go see the doctor just in case!! But it isn't worth it to go if you just have the flu because all they'll do is take your blood and give you IV fluids and send you home.