I fell down some stairs and less than two days later, my nose bled for a brief period (I mistakenly took Advil about 9 hours before this occured) . I felt mostly okay, though I ve had a dull, constant headache where I hit my head. Now, almost five days into it, my nose bled again and now my neck is stiff. I am not nauseated, though I have no appetite and I am feeling very lethargic in general. Should I be concerned?