SINCE OCTOBER BEEN HAVING A LOT OF ASTHMA EXERBATION (OCT

SINCE OCTOBER BEEN HAVING A LOT OF ASTHMA EXERBATION (OCT JAN AND JUST HAD ONE THIS MONTH. I HAD PHENOMANA AN D DID STRESS TEST NORMAL BUT EJECTION FRACTION HAS WENT DOWN SINCE JAN FROM 67 TO 45. DR HAS CHANGED MY MEDICATION AND I AM GOING TO BE GOING TO CARDIAC REHAB. ALSO WHEN CAUGHT CHF IN 2012 WAS 50 WENT UP TO 76 SO MY EJF HAS BEEN UP AND DOWN BEFORE. I GOT TO GET WEIGHT LOSS SURGERY WHAT CAN I DO TO STRENGHTEN HEART AND BRING EJF UP