It could be asthma or allergic condition.  Consult a physician

Can be psychogenic and deep breathing leads to arrhythmia causing light headedness....meet MD physician

Hi..... Dyspnea is a condition where you are experiencing shortness of breath, or breathlessness....Dyspnea is also the uncomfortable sensation of breathing. Normally, our bodies will regulate the act of breathing without even having to think about it..... It is very difficult to precisely confirm a diagnosis without examination and investigations and the answer is based on the medical information provided. For exact diagnosis, you are requested to consult your physician.... I sincerely hope that helps.....