I'm sorry you're experiencing this, and as it goes I cannot relate as such because I haven't noticed any obvious changes in my temper since my injury.

However, and this may be an OCD related issue but I cannot stand the sound of people eating, it drives me crazy sometimes. At times I feel I have to remove myself from a room because it frustrates me so much. While it may be more difficult for you to accept this since it may be PCS related, you're not alone when it comes to irrational anger and I was getting that with the food thing before I even had the brain injury that caused PCS. I have a parent who has the same thing and who to my knowledge has never had a concussion.

Next time, try and take yourself away from the situation, get some fresh air and try to think rationally. It wont solve the problem, but it will help at the time.

Good luck with your recovery.