This is an discussion that is the result of unresolved anxiety. It is not productive.

<You said every concussion results in permanent brain injury. Getting a concussion is a very common thing - there are more than 15 million concussions in the US every year.>

Correction..... 1.5 million to 5 million concussions a year.

<Do all of these people have permanent brain damage? >
Remember, that damage may not be obviously symptomatic. It may just mean the next concussion is easier to get.

<Getting hit in the head with a force sufficient to concuss is a common thing, so is permanent brain injury a common thing as well? I see people getting hit in the head all the time - do all of them have permanent brain injury that can be detected decades later in advanced brain scans, even if they feel fine a week after the hit?>
Only 1 out of 100 get a concussion each year, so it is not common. Yes, there is a youth population that has been taking risks and getting concussed. Nobody has studied the population with advanced brain scans. Besides, brain scans don't matter if the person feels fine.

<Also, does neuron loss matter that much if symptoms fade? After all, does it really matter if someone has less neurons because of a concussion, but they don't feel any different than before the concussion?>
For most, it does not matter. People lose neurons from getting drunk all the time. Life then goes on.

And if supplements are a daily commitment, does it mean that taking supplements daily for 1-2 years and then just stopping is useless and doesn't cause any long-term beneficial changes? Think of it like exercise. You can get in shape for 2 years then become a couch potato and no longer benefit from that exercise.

<You said that anxiety is an enemy to concussion recovery, and I find that true - when I put the PCS aside and ignored it (didn't think about the future after it), I started feeling better and my recovery was accelerated. But is it a good strategy? >

YES, YES, YES,

<Or should I focus on my injury, remind myself I have it, and therefore limit my activities? In my experience, ignoring PCS and just carrying on with life as I did before was beneficial for my recovery, but I fear this is a bad strategy. >

Why would this be a bad strategy ? Get on with your life. If you need to make minor adjustments, then do it and go on. Have ear plugs handy if you need them from time to time. Reduce your risk for the future by stopping engaging in risky activities. Wear a helmet for some activities (snowboarding, etc)

Or, you can focus on your injury and be wrapped up in anxiety and never have any sense of a life.

It's a choice only YOU can make. Make a good choice.