I had 3 feet of books fall on my head 10 days ago(i work in a bookstore). I went to a doctor, he said it was a between a minor head injury , but not quite grade 1 concussion . My head still has a small lump, is sore to tje touch, and if i stand up too fast i get dizzy. My co-workers kept asking me today if i was ok, they said i wasn t acting like myself. Should i be concerned?