There are many different aspects of anxiety related to PCS. Some have pre-existing anxiety that becomes worse with PCS so both need to be addressed.

Have you heard about CBT, Cognitive Behavior Therapy ?

What kind of diagnostics and treatment have you received for your anxiety ?

If you can find the right therapist, there is some biofeedback and neurofeedback protocols that can be worthwhile. But, it can be expensive and hard to get insurance coverage to pay for it.

I know of a few therapists who have good track records.