My answer would not be so much gaelic but more scottish slang.
DOO-LALLY is the most commonly used word in scotland for crazy or just the word mental.
He has gone totaly doo-lally would I think be the best answer that I could offer as it is the most common used in Scotland.
S wife walked out on him and he went totally doo-lally.
In Gaelic, the word "Crazy" (mental, cracked) is "craicéailte" or "craicte".
Here is a link to a free online English to Gaelic Scottish translator.
I cant really gove you an answer,but what I can give you is a way to a solution, that is you have to find the anglde that you relate to or peaks your interest. A good paper is one that people get drawn into because it reaches them ln some way.As for me WW11 to me, I think of the holocaust and the effect it had on the survivors, their families and those who stood by and did nothing until it was too late.