@Auldgregg
I couldn't link the PP (@Winter2020) post
to this but your comment about not being able to survive on carers allowance was in response to the post suggesting you ask for a carers assessment.
They are different things.
You are legally entitled to a carers assessment. You are his carer. You also work.
This assessment will identify your needs and it will flag his needs for a full social care assessment.
I think you can self refer, but the referral might be better coming from your GP.
The other thing you can do is register as a carer with your GP surgery. This will help you get the right information. It also helps them help you.
You can work and care for someone without claiming carers allowance.
The other thing your son is still entitled to is education. This doesn't have to be formal qualifications. It can be a quiet supported environment to help him gain social skills very gently. The gaining of social skills and skills towards independent living is classed as education. You can apply for this under an EHCP which is an Educational Health Care Plan. This can be applied for and run until 25.
It sounds very much as though the GP needs to review his mental health with a view to referring To the CMHT community mental health team (adult). He is very much in need of an assessment.
Can you get a form from his GP for him to give you permission to talk to them on his behalf? He'd have to sign it.
This is the first step to getting him help. He's not in a position to help himself. Especially if he's soiling himself with anxiety when he tries to leave the house.
He will definitely qualify to receive PIP. You can advocate for him as he's mentally unable. He, again, has to appoint you as his representative, it's another form from PIP.
All these benefits are a battle sadly.
You are entitled to 25% off your council tax bill once he gets PIP and you declare the caring you do to the council. You are also entitled to it once he's back in education.
Make a list and speak to your GP (after getting him to sign the consent form for you to speak to the GP).
Sorry, this is a lot of info. It's such a sad situation. He's really slipped through every net and you both are at real risk of the situation deteriorating significantly.