Anxiety is probably one of the most common symptoms of PCS. So, the answer is likely is you have anxiety cause by PCS.

The doctors only address symptoms they can treat. A neuro will rarely offer to treat anxiety. A psychiatrist will not usually be interested in head injury issues.

I think the key issue is to find the triggers of your anxiety. Often, anxiety can be triggered by over-stimulation. This can be visual or auditory. Sometimes, it is thought based but that is often in response to minor anxieties that trigger 'why am I feeling this way' anxieties.

Many of us manage some of our PCS symptoms by reducing triggers and such that cause these anxiety issues.