That sounds absolutely awful for you Mindgoinground i am so sorry for what you and your son are going through
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Sadly CAMHS are shit. I am in Surrey and they were beyond useless with the added twist of being dishonest and unfit for purpose here too. It certainly wasnt all about resources.
My advice and no doubt a couple of CAMHS practitioners will pop along soon to say I'm wrong and have an axe to grind, is as follows:
Write down everything that has happened and everything that hasn't been delivered, note every interraction with them. Specifically note that if no support is forthcoming, and your son sounds like a critical emergency, then you will hold them responsible for the consequences. That muag be sent to the ceo of the mh trust, copied to your MP, GP and director of Children's Services at Local or County level. All corrspondence to be sent recorded delivery so you have an audit trail.
My dd was nowhere near your son's level but when she was depressed, cutting and taking small overdoses our CAMHS office refused to support her. I got her a consultant psychiatrist privately because i could. She had a mini crisis later that year and 26 hours after taking 10 anti-histamine and two spoons of benylin took herself to A&E to make sure she hadn't harmed herself physically. Paradoxically in conttrast to your son A&E didn't bother ringing me for four hours, and when I arrived had contacted social services, booked a 1:1 MH nurse and coerced her into staying overnight in an acute bed on a paediatric ward. She was 17. She had capacity, it contravened the MH Act on a variety of levels and indeed DOLS as applicable to 16-18 year olds. She was assessed in A&E and we left that night notwithstanding the fact that staff were incompetent and bang out of order.
Extraordinary there was money to spend like that to facilitate a CAMHS review. The same CAMHS who had previously refused to help her and which resulted in private clinical care being put in place. In spite of our local hospital having all that mpney to spend unnecessarily when CAMHS assessed her the MH nurse said she would receive counselling with a few weeks. This was then backtracked to being unnecessary for 10-12 weeks - until our MP got back from holiday when all if a sudden it was switched on within 2r hours of his return in spite of them having insisted it was unnecessary for at least another several weeks.
In my experience it is essential to record in writing every single thing CAMHS tell you they will do or can't do and confirm it back to them in writing. At the end of every letter you must write "unless I hear from you within ten working days of the date of this letter I assume you accept what has been noted as a correct record"
CAMHS and the system for young people absolutely stinks. I am quite sure it is not all about resources. Certainly those who work in the system spend a great deal of time making excuses rather than harnessing their intellects (such as they may be) to make a difference.
There seems to be a culture of running rings because parents feel vulnerable and of course for 16-18s it is difficult to be an advocate without consent and of course vulnerable older teens don't want to put their heads above the parapet.
Something really has to be done for pur young people.