Yesterday I was biking and took a turn too tightly and I couldn t stop the bike so I hit a tree head on. The bike hit the tree first and then the right side of my head hit the tree. I didn t lose consciousness. I remember exactly what happened. I felt a little nauseous afterwards and have been having dizzy spells all day whenever I change directions, like turn my head fast or get up or lie down. I don t have any other symptoms for a concussion. Should I still get checked out? My head is still swollen and hurts.