We've had a mixed weekend with ds1. He had an exam on Saturday, well and good and seems to have had plenty to say in it (Othello and Vict poems) Then on Saturday the long awaited party came and he refused to go, then he went to the party after all, stood outside the door, and refused to go in (we were inside having gone ahead of him by an hour, at his request he didn't want to travel with us) rang dh and said he was going home (not upset just resigned and depreciating..oh don;t think I am coming after all, have turned back) We would have just given him a sausage and a drink and perhaps said fine don;t worry, but not to even knock on thdoor!!!!
not a scary party - two bored other children there who were looking forward to seeing him, about his age/ younger.
Today he stays in bed till 4pm (has been up "working" on revision all night till 5am) comes down, and has a chat about how stressed he feels. Then, I think he felt better 
and we all had a nice supper and chatted.
And last week he was saying how much he was looking forward to his new life at uni 
Oh dear, it is a roller coaster of emotion being a teen isn;t it, yet so small scale sometimes, tiny little shattering quivering icicles, reacting, not reacting, being wound up, then being chilled, wanting to be calm, then getting in a panic over things that we think easy/obvious. He is so shy, that is what is so difficult.