I also think it's dropsy.
Yes, it is "dropsy", but, and I am not sure you caught the IMPORTANT POINT; dropsy is not a disease, it is a symptom. A multitude of diseases ARE (well, kinda) "dropsy."
To cure the REAL disease (cause of the dropsy), you must treat the underlying cause(s), and correctly. And, that can be a very diverse range of disorders.
To put it simply, the way I once had it put to me, "You can attempt a fix to a problem. You can repeat the fix to the problem many times. The correct fix always works the first time."
Regards,
TA