<s>[INST] Hi, I feel breathless with no exertion, couhing and lightheaded. I have had a full medical, blood tests and ecg adn respiratory function tests all came back normal. I have seen an ENT specialist and he could not see anything. I have had a chest xray and this is normal. What could this be? [/INST] Respected user , hiThanks for using Healthcaremagic.comI have evaluated your query thoroughly .* This seems psychosomatic manifestation of underlying stress or anxiety   disorder most probably .* Guidelines for better recovery   -  Avoid stress , anxiety  -  Have regular , sound sleep of 8 hrs   -  Avoid smoking , alcohol   -  Regular walking in fresh air , deep breathing exercises , YOGA ,      meditations are the only curative things for you .  -  Plenty of liquids , balanced nutritious diet .Hope this clears your query .Welcome for further questions .Regards . </s>