Thanks folks.
He did have an assessment by an educational psychologist a couple of years ago, who said he was a "lovely boy". Well, we knew that, but he didn't get a diagnosis because he wasn't having problems in school. The ed psych was supportive over the phone, but did a quick basic assessment and gave us nothing, turns out he didn't even write a report about it and they have no record of even seeing him. At the time of his assessment we were told to pursue it via the GP if we really felt he needed a diagnosis.
His behaviour then was different (has been since he was born) but not troublesome - he has things he obsesses over like numbers (at the time he was obsessed with the dials on the school boiler, and the numbers going round on VCRs), maps, bus routes, time, germs etc. But he wasn't violent or angry. His dad was an alcoholic who showed very little emotion towards the triplets (he used to be a good dad, but he found his illness hard to manage with 5 kids and took it out on them - he was an emotional bully near the end, hence me leaving). So my son rarely acted up then, but when he did he was put in his place by a domineering dad.
It's sad, because of all the family, it's my son who misses him the most, yet he was the child he showed the least love to. I know some of his anger is tantrum at not getting his own way and testing the boundaries, but I'm not a softy giving him his own way, I'm trying to treat him fairly - but it ends in total house destruction. Eg. today he swore and kicked his sister in the face...and was told no computer. His mood has gone on all day on and off, and I've had to tidy up three times after him (he refuses). I have family coming for dinner, and haven't even had time for a bath!
It doesn't matter how much I take away from him - we've worked up to a week without computer, no xbox, no guitar and if he carries on - no tea - smacked bum is my last option and it doesn't work. And his moods stop as quickly as they started, and he doesn't understand why I'm still upset.
I'm so tired.
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Son with potential Asperger's.