Breathing difficulty lasting more than a few days may be caused by various factors, including respiratory infections, allergic reactions, or asthma. To determine whether it is asthma, you should consult a pulmonologist for a detailed evaluation, including pulmonary function tests (PFTs) and allergy screening. Avoid exposure to dust, smoke, and cold air until your condition is properly assessed. Prompt medical consultation is advised for accurate diagnosis and timely management.