All sounds a bit OCDish to me. I've certainly noticed I'm more likely to pointlessly check whether I've locked the door or turned the oven off since my injury, though it's not a major problem. I think I've seen a few others (maybe Mark?) with OCD in their list of symptoms, so I guess it's something that happens with PCS.

I think in general you worry way too much about your symptoms being somehow unique and terrifying. The brain is extremely complex and we all have bizarre symptoms, obsessing about each one will do us no good at all.

Best wishes!