Sorry I can't be of more help, but I came acorss something today that may be of interest to you.
First, I'm not as experienced as many other users, so you might want to take my advice with a grain of salt.
From what I understand, there is no cure for dropsy, BUT ...
I did order some Maracyn Plus awhile back and it came in the mail today. Maracyn is extremely hard to find over here, so I need to order it by mail. Anyway, it said on the Maracyn Plus bottle that it treats dropsy! Now, I don't know how true this is, or how effective it is, but that's what it says on the bottle, and based on what I've seen with Maracyn I and Maracyn II, it's a highly effective line of products.
You may want to look into it and ask other members, but seeing as I've only ever heard that dropsy is almost always fatal, it couldn't hurt to give this stuff a try. You can probably find the stuff easily in the USA, so you're lucky, but in Canada it's almost impossible to come by. If need be I can show you some links from US companies, or Canadian companies that deliver to the USA.