I'm realy not sure this is the right forum.. so feel free to move it.

While we were having maths today I sat next to a girl I don't usually talk much to. she's been away for a while, some kind of exchange student. Well she seemed to have trouble with the problem we had to solve so I asked her if I should help and she said ok. Suddenly while I'm helping her she starts crying, and I just went totally blank, got uneasy, wanted to run off, my breathing going mad. All I could think was I have to teach her, so I just kept explaining and she just keeps crying becuase she couldn't understand any of it, I guess her mind went blank, she said afterwards it was all a little overwhelming and she felt stupid. My mouth just kept talking trying to explain it, and I was so frustrated I couldn't make her understand, meanwhile there was like a RUN! signal going through my brain. It realy felt like when panicking.

Why would I react in such a wierd way to others being sad? And how do I change it? If others are physically hurt I'm usually very clear minded and good at helping, and calming them down too. I don't know where it that panick came from.