Hi welcome to Health care magic forum.
Thanks for choosing H.C.M.Forum.
You had an accident 4 days back ,and had vomiting
yesterday midnight after having food at usual time for the first time after accident. Nothing is detected in ct scan
There is possibility of getting vomiting after starvation
for 48 hours. most important possibility is the minor head injury
I advise you to consult a general surgeon
for diagnosis and treatment. You may need to have M.R.I.of head besides other routine tests, for confirmation.
Wishing for a quick and complete recovery.