Hey hi psychnitrous...you are in the right place and are welcomes. I get bouts of DR/DP when anxious and stressed, like sensory overload by overstimulation, but not as bad as you have it. Have you learned any grounding techniques? Like when I go DR, like in a grocery store with all the checkout sounds beeping, people talking, everything moving, tons of color all around, it feels like I step back and be like watching a movie, out of body/mind like-unreality. I usually try to direct my attention to an object and focus on it looking at its shape, color, texture...., or read a label, or get off somewhere quiet. I try to not get lost in the feeling, or Ill have a panic attack.
I hope you get better.