i had a severe concussion about4 weeks ago after i got hit by a car on my bike and my head hit the concrete. today as i was sleeping i moved my head and hit it against the wall as i was turning. it wasn't too hard, but it was still a good hit. do you think this is something i will have to woorry about? my conussion occured on the back of my head and i hit myself on the front this time, btw.