While camping, I was walking with my head down and I walked directly into a fallen tree that was horizontal to the ground. It struck me right across the forehead. I was taken aback at first, and then just frustrated and anxious at the possibility of another concussion. Two days later, I have brain fog and a tension headache. One thing to note is that my neck and trap muscles are incredibly tight from my backpack, so I was wondering if this was more of a concussion or a neck related issue. (was walking around 5 mph into the fallen tree). Thanks.