I was hurt in 1999 so I don't know what Drs prescribe now, but my Neurologist had me take a low dose of Elavil (Amitryptyline) every night because brain injury impairs your ability to sleep and Elavil helps that, I was sleeping 18 hours a day before taking it. You definitely need a neurologist involved, opiates are bad because the injury makes you more susceptible to addiction, a Dr should know better. When I finally got with a good Doc she had me take 4 Excedrin Migraine tablets with 2 10 mg pills of Famotidine up to twice a day, this is magic for 50% of us. A tea of passion flower, cinnamon, and cardamom can be calming.
Do stuff. Life is the best therapy. I learned how to build a computer from components and built it, then learned how to make a webpage. I learned Spanish. I slowly made big gardens all around my house. My Doc was a physical therapist when she had a near fatal brain injury, then ended up spending the money she got from the insurance company to pay for medical school.
Be patient and be willing to work because recovery is hard, and don't hold on to your old self, be assured the new self you are making is going to be a very special person.