DS is 3.2 and I suspect is on the spectrum somewhere. he has many sensory issues and I think coordination issues and I am in the process of seeing how his 'symptoms' fit the triad. I am a SAHM so the only person really to see all this apart from DH. he starts nursery this month so I'm keeping a diary and will ask them to keep an eye before going to the GP to ask for a referral.
my problem at the moment is that he's clearly miserable and I don't know why or how to help him. he's whinging constantly, having screaming fits through frustration with toys etc and has started to throw heavy wooden toys at me and DD who is 18 months in a fit of rage if something doesn't go his way. I already completely 'manage' our routine to fit around trying to keep him happy and not overwhelmed but the agressive and violent behaviour I have no clue what to do.
this morning I had to leave him in a room by himself because I was starting to get cross - he was screaming "no, no no!" and lashing out at DD and I, really scaring her. at the weekend my MIL was playing with him, getting right up in his face and saying things loudly over and over to get him to laugh uncontrollably...it clearly got too much for him and I could see him starting to get hyperactive and aggressive, luckily the game changed and he held it together until she left but afterwards had a huge meltdown again lashing out - in this instance I could clearly see what had caused it (looking back it happened a lot when he was a baby too, just more of hours of crying after too much intense 'playing') but most of the time lately I have no idea what's building up to a meltdown, he just explodes for what feels like no reason
I'm very much of the idea that he needs help to deal with emotions rather than be punished, but I think I'm going to have to start removing toys so nobody gets hurt. I believe his 'behaviour' isn't 'behavioural' at all if that makes sense, I'm convinced he's struggling and trying to find an outlet but at the moment all I have is oblivious family members and friends (he's so NT around them and saves it all for when we get home or they leave) and a HV who is sympathetic but not very helpful 
any tips on dealing with aggression with possible SPD/ASD/DCD? how can I be there for him but protect myself/DD? how can I find out what's driving it?