The one thing I am going to have to vehemently disagree with is the anxiety and PTSD needing to be "resolved". They don't work that way and it's insulting to people with mental health issues to expect it to be solved/resolved in the course of a film that takes place over, what, a week? Tony does develop some coping mechanisms (though, wtf, they appear to be the SAME ONES he was using at the beginning that weren't working?), but there isn't going to be a ta-dah! moment and then they go away. It's one of the better things about the film.

It would be a better film (barring the plot holes) if it weren't, you know, part of an already existing continuity. It doesn't line up, even taking into account character development and change.