If you believe you may have suffered a concussion you need to tell someone! While you may think you are ok, someone else will be able to give you an unbiased opinion of your state of mind.
Online tests for concussions can serve as a starting point to determining the proper course of action, but to gain accurate information/diagnosis you must visit a doctor or an individual trained in assessment and management of concussions. The doctor will be able to tell you the severity of your injury, as well as proper steps to follow in order to allow your brain time to heal.
In general, a concussion requires a lot of rest to decrease the workload on your brain. Activities such as driving, watching movies, playing video games, and any physical activity all increase brain activity and blood flow which can affect the speed of recovery.