It has been a year since my TBI. I have recovered pretty well. I have some fatigue and executive function issues but really waat to go forward, physically. The main issue is that if I try to get my heart rate up by running, I start to get headaches and feel short of breath. If I push myself through these symptoms I find it takes me days to recover. Is this normal? All the doctors say that it could be some autoregulation issue from the brain injury. That once I get to a certain level something isn't kicking in. Does anyone else have this problem a year out from their injury?