Finally, we're finding out what has happened in "shell shock." I remember a guy in our little town, who everyone called "Shorty." He walked everywhere, which was becoming 'odd' by the mid-1960s. Living in an abandoned house out in the woods, he would show up around town and everyone seemed to know him - and that he was "shell-shocked." He obviously had behavior problems, and it seemed he perceived things differently.
I also dealt with major head traumas, from which it was actually astounding that I survived. So I can completely understand the what happens mentally. Also I sympathize with