I get breathless while talking an a tightness in chest have been checked by cardio and lung doctor what is the next step i have also lost weight 6 kil?

SOB: With assumption of normal of pulmonary and cardiac condition may suggest anxiety, deconditioning or systemic illness. Suggest complete review of the work up and mental health screen by your Internist

Possibly stress: If the specialists you saw feel this is not primary lung or heart consider slowing your speaking down particularly if it is a stressful conversation. If you have not had full lung function testing where they look at all the function of the lung you should. You should also do a cardiac stress ECHO not just the ECHO. Hypertension a cause not always apparent at time at MD office. Maybe seek 2nd opini

Mgt: If the weight loss was not intentional, this may be of concern. I would suggest an imaging study of your chest and a CBC, diff, plts and CMP blood test. Did you have a pulmonary test with Albuterol? A virtual appointment may be useful in reviewing this testing and your symptoms. Your studies may be uploaded to the EMR.