My son is 13, legally blind with behavioural issues. For the past year he has had periods where he cannot help smash things to pieces; usually phones, ipads, watches, clocks etc. He does this even to his own property. Its usually followed by a period of time where he becomes frenzied and verbally abusive. I used to get mad with him but it did no good so now I'm trying to stay as neutral as possible and simply talk with him. He told me its an urge he can't control but can go no further than that. Really could do with advice or insights.