I doubt an air oxygenator would exist, it would be so much easier to simply breathe from a closed circuit oxygenator as pure oxygen bottles are prohibitively expensive and it would take a very large oxygen bottle just to increase oxygen levels slightly for the smallest room. In any case I doubt that increasing your oxygen intake would solve your problem anyway. The best things for anxiety and stress are sunlight, exercise and good diet and good sleep.
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.