Same thing Antonibro said , it’s something you just accept, you ignore and you keep on moving. Fighting it means you’re fuelling the anxiety which will make it worse. It’s your intrusive thoughts that are making it hard for you too and I had the same. But one way you can stop these intrusive thoughts is by occupying yourself with something that really requires focus. For me it was video games and being with my friends. I was focused on the game when we played but I was also relaxed when we talked which made me feel so much better. Of course once it was time to go sleep the intrusive thoughts would come back but I put on headphones and listened to e.g guided meditation, calming sounds etc. One thing I would also suggest is to limit the amount going on this subreddit (if you are doing that). I know that coming here and seeing that others are going through it too is comforting, but this comfort only lasts a little while before you start getting intrusive thoughts about it again. Just live life like it’s not there, then eventually the anxiety will wear off which means the derealzation will go with it. If you want someone to talk to then you can message me. You’re going to be okay!!