lindberg711,

I too had post-concussion anxiety and struggled with anxiety attacks, as well as panic attacks, so maybe the depersonalization goes hand in hand with the anxiety.

And, yes, I also dealt with mood swings. Irritability at times, but the main issue was depression. It was not environmental. The suicidal depression has been there since the the initial concussion. On the day of my concussion, I was actually balling crying for no apparent reason during a soccer practice, and could not stop.

Keeping yourself in stress-free environments and remaining positive can help.. but often post-concussive depression and anxiety IS due to physiological or organic changes. I am 100% positive mine was. If it's an issue for you, definitely consult a good psychiatrist who is familiar with PCS or even a neuropsychiatrist.