Weird histories involving concussion. Da Costa syndrome first appeared in the American civil war. It was thought to be some kind of heart disease that caused fatigue. But many soldiers with this were executed for malingering and being cowards. Then it became a psychiatric condition in the 20th century and people were locked up in institutions, lobotomies were used to treat the depressive effects, electric shock treatment was used up into the 1980's along with mind bending medication that reduced people to having the minds of children. In the 1990's it was realized that most of the symptoms were related to head injury and concussion.
Here's a little more info from Wiki
en.wikipedia.org/wiki/Da_Co...
At the same time in the US another condition was described, 'Railway Spine' it came in two forms one from the workers building railways where after a head injury they became fatigued and were sacked for making it up and malingering. The second came from the survivors of train crashes who reported fatigue and problems with the mind. Arguments about this suggested it was caused by physical damage to the brain and spine, but these 'strange' ideas were discarded in favor of psychological problems and people just trying it on to claim compensation from the railways.
en.wikipedia.org/wiki/Railw...
Da costa syndrome is not used in a serious medical context anymore but oddly it is used in the legal system by medical experts and insurance companies to prevent compensation claims.
The argument about the symptoms of head injury and concussion has not really changed in 180 years.