A month ago I had my first panic attack with the usual symptoms. I thought I was having a heart attack but I went to the doc and she said i was fine. Unfortunately, because of all the articles I read about people with freakish heart problems, I am not that convinced there's nothing wrong. I am now afraid to excerise because I think I am going to over exhert myself. Sometimes when I go up a flight of stairs and I think that I can't do it and that I am going to overdo it, I feel tired and winded when I reach the top. Same goes with regular walking. However, if I am with friends or I'm not thinking about it, I don't get those symptoms. Could my mind be creating these feelings? I just don't know.