If you rest with your head and neck is a relaxed but straight position, you are fine.

I do not respond to 'I'm worried I did damage or shook my brain' comments. These are irrational anxieties. The anxiety symptoms are worse than the physiological symptoms.

Simple put, Don't do stupid stuff.

I know that some activities will require I take a day or two to recover. I don't worry about that recover time or even my need to recover. I may be fatigued or irritable so I do not attempt intense activities.

It is called managing our lives. Nobody can do it for us. If we do stupid stuff, we have to manage the result.