Have tightness in the chest upper closer to shoulder and mid left chest...walking today my legs felt real light...did notl lose balance but lacked power.. felt like my legs were jello. Or almost walking on air... back pain by left scapula nd left left arm pain. Could be heart...also have had a virus infection for a month that I am getting over ...probably had a bronchitis with it that seems to be getting better. also generalized sweats. Walked in the 60 degree weather and sweated all the way during 25 minute walk.