This can happen with any sudden diet change, I would try slowly taking meat out of your diet instead of all at once. It could also be mental if your body was to be affected by not eating meat then it would take a good chunk of time to do so.
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.