@Achwheesht
Help needs to be sought
Why isn't op calling social services to help her son find a solution? She's the adult, she can't even seek social services help, that's on him?
Call and say he cnt stay at home tonight and you need professional help placing him somewhere everyone can be safe? You need mediation and intervention.
It the 'he can't come home and good luck to him calling social services im sicky o the teeth of it's which is how it reads. Not to mention the 'my poor babies, they need protecting from.... Erm my other baby who is suffering's
OP has now said repeatedly that she has asked and begged repeatedly for help for him. I'm not so sure I'd do a very good job of putting myself across well in an initial post if I was shaken up, either.
From what I understand, out of hours Child Services would be the best bet to ring, but as he is not under 16 they may not consider it an emergency to help - nor may SS or CAMHS or the police. I do agree that she should try contacting all of the above if necessary to try to ensure that he is safe tonight and while more appropriate longer term help is put in place - but I think you may also be sadly overestimating how much help is actually available for this and even (much) worse situations than this, either tonight or in the longer term.
I 100% believe the OP when she says that she has been trying to get help for him from these organisations repeatedly and been unable to get them to do anything/anywhere near enough - it's very sadly a very common thing to read these days.
You may remember the poster not long ago whose 16 year old boy had been groomed by a woman in her 30s since he was 14/15, and who had been influenced by this girlfriend to move in with her and to cut off all contact with his mother (with a previously very good untroubled mother son relationship), his friends, and to drop out of college. The OP of those threads did absolutely everything she possibly could (and I think still is doing so) and the services couldn't do very much intervention at all, it was heartbreaking to read. I know it wasn't the same situation but what I'm trying to say is that there are a great many times over the last few years that I have read on Mumsnet and elsewhere of how difficult it is to get SS and CAMHS to give appropriate assistance. I have first hand experience of losing two people in the last two years alone to suicide who were CRYSTAL clear cut cases of needing MH assistance and actively seeking out and wanting to engage with services, but our system in the UK let them down, repeatedly. Our SS/NHS/CAMHS/Adult MHS etc are extremely under-resourced, and the help that it is logical and even on paper that people should get, often is just not there, and it's not for want of somebody trying everything they can repeatedly to try to get access to it.