Hi BigWeeHag
Yes, I have BTDT and I can identify with absolutely everything you have written, so big hugs to you.
I have a now 5.5 year old DS who was DXed as mild ASD early last year when he was 4.10 and it came as a huge shock. Sounds as if there are similarities between your DS and mine - we went into our multi-agency assessment expecting to get dyspraxia as a DX if anything, because DS's main issues were sensory processing (he has no language issues but struggles to concentrate effectively) and problems with fine motor skills. Never even considered it could be ASD.
Processes do seem to vary from place to place but for us, following the multi agency review (for us this was SALT, OT and DX by paed), DS was referred for external OT sessions and an IEP was put in place for him at school which is reviewed termly, this includes things like him attending a 'socially speaking' group at school and continuing with OT within school. He has stuff like a wobble cushion to sit on and a fiddle toy to play with, to help him sit and concentrate in group sessions.
It is really hard to deal with these first few weeks, and I think you do just need to take a bit of time to just get your head round everything. To follow on though from what Starlight says, our paed is very much of the opinion that 'an ASD DX is negotiable' (her words, not mine) based on whether parents feel it will benefit their DCs or not. And I think backtolingle sums up our feelings exactly in her first paragraph. You don't want to reject help that may well be of great value for your DS, but you can't help feeling there will be a lot of cons as well as pros in accepting DX...
We initially requested a second opinion for our DS, but have now opted to leave DX in place as it is clear (and we have never denied) that DS does have some issues at school, and the IEP that has been put in place for him following DX has been really beneficial. What we have now agreed is an annual review of DS's progress and the report basically summarises that DS 'is making great progress and it is important to keep this under review because as he grows up he may develop coping strategies to the extent that he no longer meets the criteria for DX' etc etc. You may well find a similar approach is advocated for you if your DS is at this milder end of the spectrum.
The best advice I was given was to just focus on the individual needs of your child and try not to get too hung up on the actual 'label' they have been given. As you say, there are lots of positives to many autistic traits, and I am sure lots of people will post to say that your DS is still your DS and DX will not change that. But it is hard though. I sympathise hugely with the crying all the time thing. Even with all the progress DS has made, even knowing (from reading posts on here) that we are so so lucky to have got help for him so quickly - and there is not a day goes by that I am not hugely, deeply grateful for that - I still feel totally shell shocked in many ways.