It may be the use of the word water by poster is meant to mean fluid. And excessive fluid around the heart can be a problem as there can be inflammation, excess fluid, etc. is medically termed pericarditis. There is a sac around the heart that normally contains fluids between the sac and heart muscle
Diuretics have been used in the early stages of the disease to improve pulmonary and systemic congestion. However, these should be used cautiously because any drop in intravascular volume may cause a corresponding drop in cardiac output.
If I under stand your question, your post indicates difficulty breathing and that could be due to fluids in the lungs (edema). I had congested heart failure, and there is difficulty in breathing. I had to be in the hospital for a few days to reduce fluids and normalize the oxygen level in the lungs. Breathing problem was enough to get me in ER.
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