Concussion 1 was a hit in hockey. (20 days in bed)
Concussion 2 - 6 months later felt good, started boxing again, took a left hook (4 days in bed)
Concussion 3 - 1 month later, hit head on door frame (2 days)
Concussion 4 - 1 month later, hit head on Olympic bar (1 day)
Never had an issue at work. My workplace is for the most part but pretty tame. Lower security level inmates finishing up their sentence. I really enjoy my work. Have a lot of fun and laughs. So PTSD is not an issue. You are right sound is definitely a trigger. Was told by a neurologist that I have PCS and will have it for life, physio won't help, you just have to watch your triggers.