Studies have shown that even though day to day symptoms may resolve completely, when the brain is put under stress, symptoms will manifest. The reason to maintain a brain health nutrition regimen is to increase the brain's tolerance for such stress.

One expert has even gone so far as to recommend that the medical record reflect any head trauma regardless of symptoms so that if symptoms manifest at a later date, doctors can have an understanding as to a likely cause.

According to those studies, how likely is for symptoms caused by a stress induced relapse to resolve once again?

Once the stressor is gone, the stress caused symptoms will resolve. For some, it make take a day or two.

This is one of the more common problems with PCS. The person feels like they have recovered fully then they go to a concert or other event with high levels of stimulation and need a day or two to recover. We just plan on needing time after to get back to normal.

It's been more than a week since I have stressed myself, and my relapse symptoms not only aren't over yet, but they are progressively getting worse each day.
It's that common? How likely I'm to recover?

You are still in recovery from your original injury. Your self-induced stress of nit picking every detail means you do not yet know what your long term recovery level is. You need to find a way to let go of your need to define every little thing. This obsession with every detail is very stressful and indicates you have more recovery to achieve.

As I have said before, Many do not see a good recovery until they either learn to let go of their obsessions with every detail or maybe get professional help and maybe medication to lower their anxiety and obsession levels.

You sound very driven. Your combative hobby also suggests a self-medicating to give you release from your intense look at life. Competitive people tend to struggle to let go of the details.

If you tore up your knee in combat, would you expect to be able to return to combat sports without a need to moderate your level of intensity?

Knees and shoulders rarely recover fully so athletes know to protect them. The brain is less able to heal so you need to protect it.

The studies show that those who learn to accept their brain as injured and work within its limits will do much better. Those who constantly fight every little setback will live a life of misery.

But the fact that my brain was cognitive symptoms free and worked at 100% efficiency for almost 3 months should not mean that it recovered fully from the first injury (despite still being prone to relapses)?

Sorry, but due to my cognitive problems and my poor english knowledge I have not understand what do you mean, could you try to explain it please?

But I did moderate my level of intensity a lot, during this three months I have almost never left my home and I avoided watching tv and videos on the computer and any enovirment with a lot of noises out of fear of overloading my brain and having setback.

Were those 3 months of being cognitive symptom free during summer break and now you have returned to school and an intense study load?

If I remember, you said something about studying to class.

If you were doing nothing to trigger any symptoms and not taking on cognitively intense activities, it would make sense that you did not notice any cognitive struggles. That does not mean you were recovered. It sounds like you were 100% cognitively functioning doing almost nothing.

The recommended recovery protocol is to stay mentally active but in low intensity activities. Avoiding all stimulation tends to prolong recovery.

By self-medicating, I mean some people who have high stress levels and live intense lives use intense sports and activities to trigger adrenaline and other chemistries that result in a release of tension after the activity. Runners call it a runner's high.