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From reading your post, it could be your respiratory ailment compromised the oxygen level causing your heart to overwork and enlarge. The enlargement weakened heart pumping contractions and reduced the cardiac output. As reslt more blood was coming to the heart than was pumped out causing blood to back up into the lungs and fluids leak into tissues. Also, low cardiac output will send a message to the kidneys to produce more fluids. Medication can restore the balance of blood flow between the heart's right and left side. This will also reduce fluids and the heart load will be reduced with the medication you are receiving. The reduced workload will give your heart relief and time to recover.
An EKG is not very helpful...good for arrhythmia, and that isn't your problem as I read. You should be given an echocardiogram to reference your heart chamber dimensions, observe for any heart- wall movement impairment, calculate pumping strength, and observe blood flow...it is possible the mitral valve is leaking due to an enlarged, it happened to me. And ask for a copy of the echo report.
Your medication is for CHF so I don't why there is a misunderestanding?