67 yr old male. Bad cough for 1.5 weeks. After that, pressure in chest- feels like an elephant is standing on chest, up to several times per day. Few days of that, then vomiting after chest pressure episodes . Took antibiotics for 4 days, no change. Chest xray is clear. Episodes not as frequent, no more vomiting, but get winded very quickly and have to rest. What is wrong? Thanks.