So sorry you have to deal with this, prayers and well-wishes sent.

First thing I would tell you sounds simple, which is maybe why it got overlooked in my case. Keep an eye on him over the next few weeks/months. Brain cells take time to die. Symptoms may not show up for a while, often long enough that no-one makes the connection. Not just obvious medical issues, but look for personality and behavioral changes as well. For example, if there was frontal trauma involved look for unusual anger responses or irritability.

I wish someone had done this with me. I could have avoided a lot of pain and trouble.