Haven't 'met' RGO but she sounds wonderful, I'm hoping to set up something similar here in Wales when I qualify because it is so lackiong, really would advise going for it (nice t omeet you RGO, btw-peachy,4 ds's,2 with asd,doing an MA atm, used to work for homestart in support role).
From my own perspective, I think there's benefit todx but that it takes time to get past the dx process and really feel that. It'sa shock,and one that often causes a bereavement type process to kick in. I usually advise people to give it time and gradually build up support as you are ready. Our NAS has an outreach service which lets you meet the lady in your home when you are ready and ask about services- she's no miracle worker but the things she has provided have been the key factors for keeping us sane, such as the befriender scheme.
But don't rush- everything hAs to be at your own pace.
The whole AS /ASd thing.... there's a lady who came to talk to us many weeks ago now who is on the national committees for avrious things,and the DSM people are talking about doing away with the whole distinction apparently- because in many cases it is unhelpful. Many ASD's for example have a service provision cut off which bars people with AS, and also the level a child is at when at preschool can and often does change tremendously- labels are great for accessing services and also giving a sense of why /identity etc to both of you over time- but they can be self limiting, so there is at least an argument for a more fluid child based approach.
And IME with one of each, I honestly don't think it matters- what matters is to deal with the child before your eyes. My ds1 is in MS, AS....and by far the harder work of the two, needing DLA at HR, and looking at a specialist placement for comp level; ds3 OTOH is autistic,limited verbally, in SNU provision, gets MR care and is far the easier to parent. Differentiated dx or no, I know which is harder in RL for us.
But I would reiterate- for now the key is to adjust, then gradually make links.It sounds as if you are blessed with the contacts you made here,and will bew signposted to great local services...excellent.