Hit the back of my head 4 days ago still have bump i little dizzy when i lay down?

Concussion: You may be experiencing some mild concussion symptoms. However, should your symptoms worsen or you develop vomiting or lethargy, a trip to the emergency room is warranted. Only a brain imaging, such as a ct scan or an MRI of the brain, can rule out a brain hemorrhage or a subdural hematoma.

Vertigo: It's possible to experience dizziness and continued difficulties after a minor head injury, especially if you passed out and had a minor concussion at the time of a fall. If symptoms progress, or if headaches, changes in vision, or weakness develops, it's important to get a medical evaluation.

Get examined now: It is very important that you are examined to make sure that you don't have any internal bleeding or other problems associated with your accident. These things can be very misleading, that's why you need a physician to make sure you are fine.

See a doctor: Your symptoms may be reflective of bleeding in your brain and you need to go to an emergency department to be evaluated.