Severe anxiety

Hi everyone, 

I'm new to the group and have just been given a diagnosis of ASD for my 10 year old son. I'm really struggling with him at the moment as his anxiety is so severe he is only tolerating a few hours a day at school. He seems to have developed panic disorder and is withdrawing socially at an alarming rate.

He has always been anxious but never has a problem going to school before... Then after the October half term things have just got so bad.

Just wondered if anyone has any tips or anything.