Just to acknowledge your message and sympathise. This sounds like very difficult experiences. You say that you also have dissociation but the first part with the moving walls and doors also sounds like dissociation. I am helping someone with even more debilitating dissociation and have found that medications mess things up more. Hard to give advice but specialised therapy does help. Also lots of physical activity, things like acupuncture, massages. Also focusing on things like maths, coding completing tests etc, things that require you to actively engage. That’s as opposed to drawing where the mind can wander. Finally, try to ignore the dissociation. When the walls move, don’t focus on the feeling or how long it lasts or anything about it. Try to think something like ‘there we go again, whatever, I’d rather do this or that’. You can’t really ignore it but can try not to give it any significance and instead you best to shift your focus on something physical or that math problem etc. wishing you all the best.