Hey I know how you feel. Your mind plays tricks on you when your are anxious. Let me tell you that derealisation I think is easier than depersonalisation. It’s sucks but it’s easier because it is literally just anxiety.you still have yourself and your thoughts and your memories so you are good. I know it’s hard to tell yourself that it is just anxiety because the thoughts overtake your reasoning but remember that at one point you were fine. At one point you were happy. At one point the world was real and things were beautiful. It’s truly just anxiety. Believe me. I wish I would have believed people when they said it was just anxiety and that I need to relax and not creat more anxiety which can lead to even bigger problems. Your brain is in an anxious state and it feels like it’s in danger so it’s putting some space between you and the world. It’s okay. You are okay. You will be okay. Relax and keep relaxing every single day. Don’t try to reason with those thoughts or give them attention at all. You are in control. This will probably take a few months or maybe a year to get over. That’s okay. Just keep relaxing every single day and soon you’ll get better and better about ignoring those pesky thoughts. Your body will reach homeostasis again and your brain will finally stop activating the amygdala in your brain.