When he has range fits he can hurt himself, people around him, you can see each time its like he's losing a bit more of himself. Anyone any advice please?
Those fits sound like the OPD I was talking about. They look an awful lot like a grand mal, yes? Sometimes, they just disassociate, and are so far gone, all you can do is keep everyone (including the person suffering the OPD) safe.
I've seen a few (lots...
) of those OPD/fits.
The sort you appear to be describing are a horrible thing to witness, and must be worse for the person suffering them, especially with the apparent memory loss.
They get angry/upset about something, and that leads (almost faster than anyone else can react) to OPD/meltdown. At this point, there's raging, throwing whatever is close to hand. Then comes the seizure. They look glass-eyed, and as if they're struggling to breathe. They might grasp at their throat, and smack their lips, as if struggling to breathe.... then they're gone with the wraiths. When they come back, they have no memory of the OPD or the incident that triggered it....
Okay, the above is something I've seen regularly. and is described almost exactly the same way by Paul Broks (Into the Silent land) It's a classic epilepsy behaviour, and one of the ways OPD presents in autism:
"They were shadowy figures with a pungent smell of elecricity, a sensed presence, but no one there. Odd to identify the smell of a seizure with electricity, which is odourless, but apt for an electrical storm in the brain."
"The ethereal visitors are part of the epileptic aura, a state on altered awareness that serves to forewarn of an approaching seizure. it also has another, more visceral, feature. Naomi says it feels like a sparrow fluttering its wings in the pit of her stomach. The bird ascends to her throat, becomes trapped, and struggles to escape. up to this point, under the gathering gloom of the brainstorm, in the company of the empty shadows and the sparrow, she is fully conscious and can articulate her experiences. Then the storm breaks and she is swept beyond reflection. her eyes become glazed and empty. she tugs at her clothes, smacks her lips, and keeps wiping her nose with the back of her hand. I've seen her in this state. She has gone with the wraiths. They have left an automaton, acting out a purposeless, robotic routine." (p26 of "Into the Silent lands)
www.amazon.co.uk/Into-Silent-Land-Travels-Neuropsychology/dp/1843540347/ref=sr_1_1?dchild=1&keywords=paul+brok+into+the+silent+land&tag=mumsnetforu03-21&qid=1616684167&sr=8-1
Does that sound like a reasonable description of the sort of rage/meltdown your nephew suffers?