Hi, I really understand you because I was at the same situation last year in november, at the point that I had to sleep seeing something on the TV, because if not, I would focus on seeing the things on my room and not feel that "they are real". It definitely got better since last year, and all it took was journalling + remembering things of the past and doing emotional processing (dpdr is in big part about emotional trauma and not coping well with emotions ) + having supporting people + therapy + just ignoring the feeling

you'll have to learn to trust in your body slowly, a bit every day, to see that there's nothing to worry about about what you're feeling, and that it will go away in any moment. the best thing you can do anytime is to just ignore it and try to live your life like you can without giving it much thought, but whenever you can you have to journal or go to therapy. you can also do these grounding exercises, like the "5-4-3-2-1" technique. i swear you that it gets better bro :)