I can relate....I feel at peace when offering comfort to another person. All of a sudden, it's not about me and my problems. It's also one of the few times I feel absorbed in the moment also.
A strong emotional feeling provides much to be evaluated, and much to learn from. The OP sounds like she really engages in an analyzing process of why she responded so strongly....think of what wisdom gleaned from that process.
Although, sometimes the feeling is disproportionate to the situation, inconvenient, embarrassing, unpleasant, etc....and it really didn't have to be that way.