I'm feeling so embarrassed and upset by what's happened. I've come to London for work and I'm not used to the tube. It stopped in a tunnel and I hate that as have a fear of being tapped in and don't know why. I tried to stay calm but was trapped for about 40 minutes and if was so hot. I stared to feel as though I was going to pass out and had a big panic attack and other commuters had to give me water and try and calm me down. I am now so ashamed and embarrassed and need to know how to stop this fear ruining my life. 