My 6 year old son has a concussion. This happened 4 days ago, we have been to the hospital twice and was told he should rest. My son has had no energy, has headaches, he is hot to the touch and sometimes as a fever. This started 3 days ago and hasn t stop. Today his hands and feet are frozen but the rest of his body is hotter than normal, no fever at the moment. The tip of his fingers are a little blue as well.He is lying still resting and his little heart is pounding. Wondering if this will pass and is part of his head injury or is this a bug of somekind that his body is fighting?