Hi I am experiencing shortness of breath since a month. I have been tested negative for ecg , 2d echo, stress test and d dimer , pft as well. The episodes happen mostly in morning 3 to 4 hours after i getup and sometimes during evening hours. There is no wheezing , no running nose no cough and mu chest is clear per x ray. Are these symptoma of copd or anything related to allergens ? Appreciate if anyone can provide some insight. Thanks