I was thrown from my horse three days ago. I landed on my back but the back of my head hit very hard on the ground(I was wearing a helmet) I got a tremendous pain through my forehead at the same time, also felt very sick. I did not lose consciousness at any time. Was checked out I the ER no CT done. I was told I had concussion and most likely had bruised my brain. This afternoon when trying to rest I m getting quite a bit of pressure in my head, so have to sit up, then the pressure goes away. Is this a normal reaction when one has concussion, also how long roughly until symptoms pass. Thank you