Thanks for your reply!
Yes, my doctor told me that what I have is not very serious condition and exercising such as going out, walking and this light med should help me. I really do it, my fear is mostly when I am surrounded by people. It was easier when it was winter - no people during the cold time, no noises, calm streets - I was walking during the day. But now, when it is sunny, more noisy and full of people, I have problems going out.
When I sufffered my first panic attack three years ago, I was also afraid of going out in public for fear of losing control. When you fear leaving your house (I believe it is referred as agoraphobia), it can definately be a symptom of anxieity. Have you talked to a therapist (psychologist, psychiatrist) about your fears. I had great success with a combination of meds and therapy. By discussing with with a professional, it helps you to understand the panic and anxiety cycle.