I did all blood test( including vitamin d,b12,tsh,t4,cbc,crp, etc)ecg,tmt ,ct chest,pft ,ct brain , upper GI endoscopy Every reports are good My heart rate is between 65 to 72 Doctor said all reports are ok But I feel dizzy, hangover, heavy head , breathless/ heavy breathing during climbing stairs,weak legs etc I am on medication propanolol10, clonozopam0.5 and paraxtine 12.5 My main problem is heavy breathing during climbing stairs or walking and weak legs I visited to cardiologist, pulmonologist but nothing found One of pulmonologist suggests me inhealer but after use I feel more breathless..then another doctor said your lungs are fine ,no spasms so don't take inheller Could you guide me what is the cause of my issue?