Help with meltdowns

Hi everyone, 

Im fairly new here and have read a few of the discussions and replied to some.

My eleven year old goes through cycles with his aspergers, at the moment he is having meltdowns  left right and centre.

He gets physically aggressive, throws hinges, scares my younger children (10 and 6) hits , kicks, punches, spits, screams at us breaks things and so on. Myself and my hubby (not his dad biologically) are becoming very worn down and tired. Wfinally got his diagnosis two weeks ago after fighting for ten years. 

We no longer no what to do or try.

Basically any help or receive could bebrilliant.

Thanks

Kimx