I have Stage IV COPD although I am not on oxygen yet. A month ago I had an exacerbation from which I am still recovering. Feel great in the morning and early afternoon and can exercise for about 30 minutes. The rest of the day is not that great, unfortunately. I feel like a different person, with trouble walking any distance over 200 feet. What really scares me are what I think are panic attacks--that feeling of tightness in the chest, increased heart beat, and breathlessness. Are these panic attacks? How do you cope with them?