We have been through this with both kids, it makes my stomach turn.
We have been lucky in that we've had good and bad days and the bad ones seem to fade and good ones return.
I have talked to teachers/aids about watching them on the playground to make sure that they are OK - one teacher played with my DD one day when she was having a bad social day.
I have also stressed the fact that I, as a child, had playground experiences like this, and that nothing is "wrong" with them. It seems to help a little, because from their point of view, everyone else seems to be having fun all of the time, when that just isn't the case.
