My husband came home today complaining of a very bad headache, took some ibuprofen then went to lie down. He has since vomited several times and keeps getting chills. He is not running a fever. He said the headache came on suddenly after stopping for lunch. He also says it's the worst headache he's ever had with lots of pressure at the base of his skull. Could it be food related or could he possibly have come down with something serious?