Hello, Calexico.
Honestly, and this might be shameful to admit, I have done close to no research on PTSD. I just went with what basic knowledge I had on PTSD and just followed my heart as how to best represent it in my game. I thought about how I would feel if I was in Michael's shoes and went with that. I am really happy to hear some of you guys say that I managed to convey that feeling accurately, without insulting or belittling actual PTSD victims.
I'm sorry I couldn't provide you with actual research to help you out with your presentation, but if you have any question I'd be happy to answer them.
I hope the full game will live up to your expectations as well.
God bless and good luck with your project!