“Concussion?”

Last August I suffered a severe concussion that left me confused, forgetful, off-balance, and anxious. It was a scary experience but I recovered except for sensitivity to light. Then, just a week ago I had what I can only describe as a psychotic episode. I was off-balance, extremely frightened, and unable to drive. I had a hard time sleeping and couldn't figure out what was going on around me. On the 4th day of that things started getting better but I still don't know why I experienced that. It felt like how I felt after the concussion but more intense. It was terrifying. Do you think this episode and the concussion are related? I'm not sure what to do but am fearful it might happen again.