I have found that after a day of that, I would come away with a headache, irritable and generally feel like I was in a fog. My ears felt like they had pressure on them. Sleep was the only thing that seem to help with it going away.
I still feel it today when at the range sitting beside someone that has a muzzle brake beside me. The concussion wears me down quick.
There certainly may be other contributing factors like the airborne nitrates theory, but what you're describing above is a textbook list of symptoms from minor TBIs.
