What Causes Nightmares After Taking Butalbital And Ondansetron For Concussion?

I suffered a concussion on the rights side of my my head around my eye. This was 3.5 days ago,went to the doctor about 36 hours after the hit and was checked out , confirm as a concussion,etc and given butalbital and ondansetron. Now I have major trouble sleeping more than 45 minutes to a couple of hours at a time, have nightmares, feel agitated and tired, and having some twitches in my opposite side (left) leg and arm. Prescriptions don t seem to work other than not throwing up today. Are these normal recovery issues 2 days after seeing the doctor? I plan on going back tomorrow morning first thing as today is the 4th of July and my doctor is out.