My son is 17 years old and has had a couple of concussion the pass couple of years in basketball. He has seen a doctor and was cleared but he had continued to have some dizziness, light headed. He also has fatigue and lack of focus. We just had some blood work and ruled out diabetes, low blood sugar and his cholesterol numbers are good. He has high blood pressure occasionally like when he goes to the doctor. His last concussion was in Nov. of last yr and 11 months before that was the first one.