Cough till I throw up, barely eat or sleep because I cough to much. Nothing helps the cough. Should I be worried?

Whooping cough. Post passive vomiting with a severe persistent cough makes me think of pertussis, or whooping cough. This is treatable, if it is not pertussis, you are still not sleeping and sound like you need some relief. Get evaluated and see if there is something treatable. Good luck!