You might want to look into books by Alan Gordon and those he has worked with (they get recommended from time to time round here for chronic pain). Whilst they do primarily talk about pain, there’s some evidence to suggest that some of the neurological problems caused by post-viral conditions are to do with the brain getting stuck in a heightened state of “fight or flight”, which is also one of the causes of chronic neurological pain. This would also tally with what you are saying about your anxiety.