I did push for the tests Liffey - mainly after talking to the wonderful people on this forum. I kind of expected my son's speech to be delayed because he's in a bilingual household and was just surfing a bit to see if there was a particular age after which I should start to be concerned - that's when I came across The Importance Of Pointing and realised that at 16 months my son didn't do it (or follow a point).
I did the MCHAT myself at home which he failed at 16.5 months, although he would have passed it at 18 months, but by that stage we already had a referral. I just wanted someone who was qualified to do so (rather than friends and family) to tell me to stop being silly and go away, but none of them did.
Apart from the lack of non-verbal communication, I couldn't see much of a problem in the other areas of impairment (social interaction and imagination) - I mean, really, show me a 20 month old who lights pretend candles with pretend matches on a pretend birthday cake. Where are they, because I don't see a whole lot of social interaction and imaginative play at the playgroups we go to. Maybe they are all sipping martinis at cocktail parties and networking
I was very much like you in that I expected them to come back and say "hmm, we see what you mean and he might be in the 'at risk' area, but it's too early to tell" or something like that, but they didn't. They came back with a very clear diagnosis. I met again with the lead psychiatrist yesterday and quizzed him hard - 'are you SURE he's on the spectrum?' 'no, but I mean, are you REALLY SURE?' etc etc ad infinitum. But yes, they are quite sure that he meets the diagnostic criteria.
I think it's partly a shock because everyone in real life had been telling me I was mad to think that anything was wrong. Even now I wonder if it was a mistake to pursue my worries (my SIL told me I was 'ruining his childhood, you should just enjoy it'). I see other kids at playgroup who display traits and their parents are blissfully unaware. Sometimes ignorance is bliss. Rationally though, I know it's not about my state of bliss and me 'enjoying his childhood', it's about my son and his future. His best chance for a better prognosis are if he gets some help now.
I really do feel for you. It's a terrible shock, even if you've been preparing for it. I've found much comfort from the wisdom from the people on this board though.
Look after yourself - and stick to vodka not gin - gin makes you maudlin