Any time you start a brain focused Vitamin regimen is good. You would be wise to get started and stay with it for life because your brain has been compromised. It will never heal completely so taking good care of your brain will improve your long term experience.

Have you seriously looked for concussion programs? I can't search foreign language services but most areas that have soccer/futbol, boxing/MMA, rugby and such have athlete based programs. Auto accidents cause enough concussion that neuro rehab hospitals usually have some experience.