dear user you need not to worry as breathing difficulty is acommon problem ...you only need bed re..st and plenty of fluids administration and you can take ibubrufen tablets for relief of symptoms and you will be ok..you should discuss with your doctor to do chest x ray and complete blood count as anemia may cause these symptoms .. but in my clinic i see it is simple problem commonly occur to those who havenot bed rest and have effort or work while having common cold that makes fatigue and shortness of breath .. so you need only to have rest and avoid any stress and anxiety as it may cause these symptoms alot wish you healthy life