calling for season 2 spoilers

[steff3.livejournal.com]

Hey-I am new to the fandom and really am fond of spencer reid! I know the gist of what happened during season 2 and am currently watching season 3 and 4 after skipping most of the episodes after revelations and the picking up on the season finale. I find that I have a squick about seeing spencer behaving unlike himself or being embarrassed on his behalf because I like him so much. Its a bit weird as I could normally pick any other character having a breakdown of sorts and casually sit back and watch but even seeing clips on youtube of that period is too much to handle for me.As a substitute I have been reading been reading fanfic and thinking back to the conversation on the phone between gideon and hotch about Reid's 'issues'.So my questions are:

How much did the team individually and collectively know about his drug use and PSTD issues?
How nasty was Reid to Emily?(This is always brought up in fic and I wouldn't know otherwise)
Touchy,irritable and late to meetings-what was his behaviour really like?
Did hotch and giceon or emily talk to him after his changed behaviour ?
How addicted was he or how bad did it get?
I've heard the storyline ended too fast and not enough of it was shown? True or not?

Sorry for the inquisition-just give me your opinion=Thanx