You will not be fit enough to decide for yourself. Severe headache, nausea and disturbed vision are some of the symptoms

Signs and symptoms The signs and symptoms of a concussion can be subtle and may not appear immediately. Symptoms can last for days, weeks or longer. The two most common concussion symptoms are confusion and amnesia. The amnesia, which may or may not be preceded by a loss of consciousness, almost always involves the loss of memory of the impact that caused the concussion. Other immediate signs and symptoms of a concussion may include: Headache Dizziness Ringing in the ears Nausea or vomiting Slurred speech Some symptoms of concussions don't appear until hours or days later. They include: Mood and cognitive disturbances Sensitivity to light and noise Sleep disturbances Head trauma is very common in young children. But concussions can be difficult to recognize in infants and toddlers because they can't readily communicate how they feel. Nonverbal clues of a concussion may include: Listlessness, tiring easily Irritability, crankiness Change in eating or sleeping patterns Lack of interest in favorite toys Loss of balance, unsteady walking Causes Concussion Your brain has the consistency of gelatin. It's cushioned from everyday jolts and bumps by the cerebrospinal fluid that it floats in, inside your skull. A violent blow to your head can cause your brain to slide forcefully against the inner wall of your skull. Even the sudden stop of a car crash can bounce your brain off the inside of your skull. This can result in bleeding in or around your brain and the tearing of nerve fibers. http://www.mayoclinic.com/health/concussion/DS00320/DSECTION=1

if you can hold down a glass of coca cola, you don't have it, if you vomit it up, you do. that is what they told me anyway...