Welcome to HCM,
With information you have given it is not clear what kind of problem you have there is possibility that you have water in lungs that means due to some kind of heart problem you have swelling in lungs which responds well to water pill
where diuretics increase urine output and removes excess fluid from lungs.
But you are taking MYTEKA which is for allergy and asthmatic problem where there is bronchospasm
and inflammatory edema
which needs inhalation and may be cortico steroids
as advised by treating physician.
Consult a Good Physician and detail cardiovascular and respiratory examination and X ray chest ,ECG, Echocardiography
and Pulmonary Function Test will give exact diagnosis and then treatment can be planned.
Treatment for life depends on your disease and result of investigations.
If you have some disease which can be cured it can certainly cured with medicines or surgery.