Let us know how you get on with the Neurologist. Here's hoping that your depersonalization will fade away as you recover.
If you get time you may want to check out some past posts here.
If you use the Advanced Search feature and type in "depersonalization" e.g., then check the Traumatic Brain Injury and PCS Forum box, you'll bring up pages of past posts that contain some really helpful information on how others deal with their periods of depersonalization during PCS recovery. Work on your stress levels especially keep positive about recovery. Check diet and take note of specific supplements that others have found helpful.
https://www.neurotalk.org/search.php
take care