Brother threw up 4 days ago. my stomach has been uneasy for the past week or so. some nausea, on and off diarrhea. am i going to throw up??

Maybe.: If you are sick with a gastrointestinal infection that can be one of the symptoms. Try to sip peppermint tea or maybe a dilute electrolyte solution and stay away from any fatty or heavy solid food until you feel better. If your brother was sick and got better on his own, most likely you will too. Once you feel ready have toast, bananas, rice or apple sauce until your stomach settles.