I think your explanation makes sense. Whenever someone goes against me in an antagonizing way it does feel like their taking away my power. I'm glad to hear there are ways to deal with this. I think the other side of the coin is that I feel I should not have acted so emotionally to having to pay for the book. Like I couldn't control myself and thus I really have no reason to complain. I also have a tendency to place the blame on myself when someone treats badly. It's always a great balancing act that pivots from my fault to their fault.