I would guess that, like the rest of the world, jersey wants to see that all other avenues have been considered before stumping up for residental schools. Plus they are likely to want to avoid direct responsibility for boarding schools etc, so foster care and short breaks seem to be the main focus of social care input. Presume you know these links already but just in case...
scroll down for autism jersey and also has details for mencap and district nurses respite schemes. Even if it looks irrelevant to your ds, they may have an idea where to point you.
Also state provision and special schools
Without the positive effects of methylphenidate and melatonin, I don't think I'd be able to parent ds. Other medicines help other dc in similar ways, risperidone in particular sometimes help with anxiety related difficult behaviours. Music therapy was great for my ds. Theres one called fiona speller who might be wrth researching. Occupational therapy, CBT and speech/language stuff also help.
You dont say how old your ds is nor whether he has other learning issues, but it all sounds just too hard right now. Respite, the education input, medical and therapies stuff etc need to be sorted, plus most mums need emotional, practical and possibly medical and financial assistance at some point. And I'd suggest if you're feeling you can't go on, then despite the needs plan, something your family is getting is inadequate.
You dont say how old your ds is nor whether he has other learning issues, but it all sounds just too hard right now. Post diagnosis is an awful time, well it was for me, and it improved when stuff started getting done.