My Grand father returned from Gallipoli to run the family business. He caught cerebral malaria whilst serving with the Army.
His condition worsened back in blighty and after a few years he ended up having treatment in a mental infirmary. One day, he found a bottle of Lye, a very caustic, corrosive, harsh cleaning medium, and drank it.
He died a very painful death. I still consider him a casualty of War although he died in the late 1920s. He was a volunteer (TA) and one of the first to be mobilised. He didn't have to go as he would of been classed as Essential Occupation.