Slightly droll this - but let's share the reasons for why we or our disabled dc have been refused help from SS or similar plus some of the least helpful/most banal comments that such agencies have told you:
I'll go first (I have many!):
'Your ds is still very young - we don't usually think about providing respite care until the child is about 7yrs old' (implication: we don't care if you drop dead of exhaustion in the meantime because that will save us money)
'you need to set boundaries' (no, really?)