Not to be morbid but those with the most arrogant attitude about your continued struggles could be told, "Concussions can be a invisible injury that lasts for years. Did you know that concussions have caused 7 NFL and NHL players to commit suicide in the past 2 years? Some of the football players were never even diagnosed with a concussion because their concussions were so mild."

Or "15% of concussions cause symptoms lasting more than 6 months and even years. Scientific research shows that nobody ever fully recovers from a concussion. They may recover from all of the obvious symptoms but often become good at hiding the less obvious symptoms. I even know people who are on permanent full disability from a concussion."

Just keep in mind, some people never listen or learn.