MY 12 YR OLD CAME HOME FINE TODAY ATE A

MY 12 YR OLD CAME HOME FINE TODAY ATE A BOWL OF CEREAL AFTER SCHOOL THEN FEW HRS LATER STARTED THROWING UP BUT NOT WHAT HE ATE PRIOR, IT WAS APPLE CHIPS I GAVE HIM FOR LUNCH.... HE'S BEEN IN AND OUT OF SLEEP WAKING UP TO VOMIT AGAIN N AGAIN AND IT'S NOW A BROWN COLORED BILE I'M GUESSING BC HE'S WRECHING BADLY-SHOULD I TAKE HIM TO ER FOR AN I.V.??