Every concussion leaves permanent damage. The big question is whether it interrupts a normal life. For most, they only see a return of symptoms when they are under stress. The repeated question of "what will my future be?" without focusing on the here and now to move forward is counter productive.

Second Impact Syndrome is not from a basketball to the head after 5 weeks.

You still have not explained the first concussion.

What is cognitive regression?

You may have a bit of a relapse from the original concussion. That is not uncommon. It can be from the actual physical impact or it can be from a "Oh no. I took a hit to the head." anxiety. The symptoms are usually the same.

There are plenty of symptoms that will interrupt complex cognitive processes without being brain damage to cognitive processing. Many will find they have a different and less effective way they process ambient stimuli so they have a lesser level of focus on a task so the math processing that was so easy before now takes an effort to disregard the ambient stimuli so it does not interrupt the math processing. Anxiety makes this even worse. A common term for this is "Stop to Think." Often, once the 'Stop other distractions' is done, the thinking is much easier. Doing math with ear buds blasting can become a problem that did not exist prior.

An important concept to understand is: Every concussion is different. What one person experiences has no relation to what others experience. The experts cannot even predict the severity of symptoms. The only predictor is pre-existing conditions. It the person has an intense lifestyle or stressful or anxiety filled lifestyle, they will have more symptoms and they will last longer, statistically. There are always the rule breakers. As I said, there are no normals.