I'm no expert but some of the things he, like issues with substance abuse, difficulty with health eating and exercise, issues with paperwork. This might be stuff social services could help with. Have you had a needs assessment to see if you need help from social services? The care act says your assessment should consider the following aspects of your wellbeing that you might need support with:
personal dignity (including treatment of the individual with respect);
physical and mental health and emotional well-being;
protection from abuse and neglect;
control by the individual over day-to-day life (including over care and support, or support, provided to the individual and the way in which it is provided);
participation in work, education, training or recreation;
social and economic well-being;
domestic, family and personal relationships;
suitability of living accommodation;
the individual’s contribution to society.
A lot of what you're talking about would fall under that. The question is how much could they help you with practically. I mean they could send a social worker rough to help you with paperwork, CVs, etc.
All I can sugest is that you quote the "Statutory guidance for Local Authorities and NHS organisations to support implementation of the Adult Autism Strategy" to them which says:
Under the Care Act (from April 2015), local authorities must:
Carry out a supported self-assessment of the care and support needs of an adult with autism if that is what the adult wishes (providing they have capacity to consent);
and remind them that the autism act says this guidance:
Guidance or revised guidance is to be treated as if it were general guidance of the Secretary of State under section 7 of the Local Authority Social Services Act 1970 (c. 42) (local authorities to exercise social services functions under guidance of Secretary of State).
and that the Local Authority Social Services Act 1970 says in section 7:
Local authorities shall, in the exercise of their social services functions, including the exercise of any discretion conferred by any relevant enactment, act under the general guidance of the Secretary of State.
and that in the court case of Regina v Islington Borough Council Ex Parte Rixon the court found the council must follow the guidance unless it has a good reason not to. Therefor the question arises what good reason do they offer for refusing you an assessment given the guidance says the local authority must if you ask them to? Not the NHS or the health carer it says the local authority must do this.