Whenever I have to talk or sing in front of a crowd/class or just talk to someone I start stressing and feel a numbing pain in my chest. In normal situations such as car, plane, or train rides I start worrying there will be an accident and me or a loved one would die. In one embarrassing situation on a 3 hour flight I started crying and the pain in my chest worsened terribly. I was also shaking. Are these signs of anxiety, or am I just anxious? Please help.