I've been trying (and failing) to get her to remove herself, listen to music etc. when she feels tense, but she can't predict it. A lot of the reason for the house move was to get her a much larger room, so she had a bit of 'sanctuary' instead of her old box room where she had to climb on the bed...
Gave up with trying to do her new room up nicely because things would be trashed within 24 hrs, and I can't afford to keep replacing them, haven't started on the other DC's rooms yet as I was constantly replacing basics in DD's room, like bed frame, curtains, curtain poles, shelves (she snapped an entire bookcase into matchsticks during one meltdown, and then did the same to her shoeshelf.)
Thing is, afterwards, she gets upset and angry with HERSELF because she doesn't know why she's broken her own things, and she says she doesn't even know she's doing it at the time.
Still got to fix the wall, my mate is choka block with paid work & his DC's, and can't do it, and I can't face ringing round for quotes for replacing a section of plasterboard. Police estimate the damage at £200 - £300. I can't see when I'll have scraped that together.
Still need to replace DS1's carpet and the stair carpet, as they are the ones that were there when we moved in (they all are, but those two are actually dangerous).
And I have two more banister poles (balustrades?) to replace too. Of a discontinued design, so I'll have to get them specially made again. The last one was £25.