Derealization is indeed anxiety-driven. The best way to deal with this symptom is to find ways to reduce your anxiety levels. Remember that, among other things, this means learning to accept your symptoms (including derealization) so that you don't make them worse by worrying about them. Also, it is often helpful to do things that can distract you from your symptoms. Being outdoors and being with other people seem to help many people deal with derealization. Also remember that derealization is unfortunately one of the longer-lived anxiety symptoms. Regardless of what you do, be patient. Derealization can take some time to go away.