Lack of control of the environment is often pinpointed as a cause of frustration and stress in confined animals. When the animal cannot control things, such as the feeding time or the lighting program, and when it cannot escape from things it finds unpleasant, it often behaves in a manner that indicates frustration.
Cavitation can also cause excessive pump vibration, which could damage pump bearings, wearing rings, and seals. A small number of centrifugal pumps are designed to operate under conditions where cavitation is unavoidable.
In this case the tissues are retaining both water and protein. Diuretics would cause the kidneys to remove fluid faster from blood while protein in the tissue spaces would be drawing fluid from blood into tissues - resulting in dehydration of the blood. Eventually the diuretics can actually aggravate water retention. The doctor should treat the cause of the leaky capillaries.