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.
There is no such thing as "water around the heart".
The blood vessels are like pipes in a plumbing system. The heart is the pump that makes the water circulate through the pipes.
When there is too much pressure within the pipes (too much fluid), it puts a strain on the pump (the heart). Long term pressure on the pump causes the pump to enlarge.
The so-called "water pills" cause the excess fluid to be urinated away, thereby reducing the strain on the heart.
When the fluid level becomes too great and cannot be urinated away the blood vessels "lead" fluid to surrounding tissues (causing swelling, especially above the ankles).
The difficulty breathing may be due to many factors. It may be due to heart problems and it could be due to problems within the lungs due to smoking, for example.
If an M.D. tells you to take a "water pill" there is generally a good reason and you should listen to him/her. The most common water pill is Lasix, so called because it "lasts six hours".
Another name for a "water pill" is a diuretic.
Vitamin C, in doses of 1000 mg or so also is a mild diuretic.