If you are fainting or becoming lightheaded after your accident, you may have a head injury. Dizziness, headaches, cognitive problems and blurred vision may occur immediately after your accident or sometime later. Symptoms of a serious concussion may be revealed weeks or months after your injury. Usually, nausea and problems with equilibrium point to a vestibular injury. These injuries damage your inner ear and can move to the brain. Regrettably, these injuries are frequently misdiagnosed. Nightmares, unwanted memories of trauma, anxiety, heightened reactions and depression are signs of PTSD. Also known as TMJ, this injury involves inflammation of a bone hinge that connects your jaw to your skull. Unfortunately, if you develop TMJ, you may have a TBI.