I am also ??? about him rushing to the pharmacy when you said you wanted to go. It would be hard for me to disengage with that instead of being annoyed and angry.
I never heard of the fawn response before but recognize it as something I do!
This morning I was asked to provide feedback on a program I'm not enjoying. It feels like a double-edged sword - they ask for feedback but I don't think they really want it. I spent twenty minutes trying to figure out a diplomatic way of expressing my thoughts. Disengaging is a better option.