Is that a new thing and not just your personality? I'm more rational and it takes a lot to get an emotional reaction out of me. That's not emotional blunting. I prefer to think though I am aware of my emotions. In a situation where you need to deal with something, like a sting, reacting with your head is much more wise than having an emotional reaction.

If you were panicking etc, that be stupid and foolish not the ideal picture of mental well being especially after reading the appropriate information and realizing that he will more than likely be fine.

Your reaction to think is something to be proud of rather than to worry about. Of course, a sudden personality change is concerning...