If your room is a safe place for you, perhaps work on expanding on that, making small changes to really bring out that feeling of safety.
I'm thinking particularly sensory things: changing lighting to lower, or coloured lighting, white noise, plants, scented things, calming pics on the walls, blankets and pillows and rugs underfoot. Make it your version of a calming sensory experience being in your room.
And when yelling starts up? Nothing beats a pair of noise-cancelling headphones, but if you're tight on cash? Music through headphones (better still, guided relaxation through headphones) to drown it out, then engage your attention on something else, like reading, colouring, painting, beading, writing, whatever is most 'you'.
It makes sense that you're chronically locked into some degree of dissociation if that's the vibe of the household you live in; so actively working on a plan to move, and setting that in motion, may in and of itself help relieve some of that distress. Social workers and counsellors are often a great resource for how to make things like that happen quicker.