I have been experiencing pain in chest for the past few years but since the last year it has increased in strength and frequency. its mostly in the middle/left side of the chest, at times in the shoulder or back. i also have a persistent cough which doesn't seem to go away. the pain in the chest becomes worse with exercising ,walking up long distances or stairs.i have also started to have cold sweats in the middle of the nights, at times my arms are numb.