Hi thanks for your question.
You are having runny nose and swallowing some fluid every minute along with dizziness
and nausea following hit on your head by a box.Don't waste any more time rush to ER and get your CT scan
skull done.Most probably your having CSF rhinorrhea
(leak of brain fluid ) which occur in the fracture
base of skull .CTscan will confirm or rule out fracture skull bone and will also rule out any bleeding inside your brain responsible for other symptoms your having.
Hope this answers your question.