Help!

My son is 16 and has had his assessment for asd after waiting 4 years the decisioj is a forgone conclusion at the minute. He also suffers from depression and anxiety.

over the last few months everything has been dramatically declining, he is still under the care of camhs however as he wont leave the house the assistance he is getting is very limited.

he struggles with everything he wont leave the house, he has no friends, he spends all day mostly playing minecraft and watching youtube.

but even while he plays it everyday he hyper focuses on one aspect of the game and if it doesnt work out exactly how he envisioned it he says he wants to die, there seems to be no give n take or room for error, whenever anything isnt going how he wants he would rather die. 
it takes him hours or days even to move past this there have been a lot of incidents of self harm and definite thoughts of ending his life 

i wake up every day with a sense of dread in the pit of my stomach ( is today the day ) 

we are receiving limited help and i just dont know how to help him myself.