I Have Coronary Heart Failure. My Doc Says I'm Fine...according

I have coronary heart failure. my doc says I'm fine...according to recent test. just had a second stent but I feel cold and I sweat something awful at the same time. Recent I was in the hospital for shortness of breath...took me to my knees and I thought it was a heartattack...He put me on oxygen. I still sweat and am cold to the touch. Any reason for this?