Does he actually express anger over this or say anything or keep anger about this inside??
He doesn't express anger over it and does not seem to be angry. Mildly irritated would be a better description.

When does he tend ot be concerned about the idea there could be something serious about this? And does he mind being alone when worried about it? He is not overly concerned about its being serious. He says he has just had fleeting thougths that way. He doesn't mind being alone when thinking about it.

Was he sad after leaving family and has he cried any? He was sad after leaving family, but not overly so. No crying to speak of.

Has he been thinking of family since returning adn if so what about? Just normal thoughts and wanting to know how they are doing and interested in their lives.

What position is his arm in when sitting at the computer Normal keyboard position, elbow down