Wow, I'm really sorry.
Have you tested your tank for ammonia, nitrite, and nitrate? If so, what are your current readings? Have they changed?
Please tell us about your tank maintenance: water changes (how often, how much, how done), cleaning, anything else you do to the tank. What meds have you been using? Any other chemicals? What fish do you have in there and what sort of losses have you had?
Poor water conditions weaken fish and make them susceptible to disease.
All this info can give us a clue why this may have happened and can help us advise you how to proceed. Unfortunately, dropsy is very difficult to treat. IMHO the best advice will be focused on getting your tank straightened out so that hopefully you won't have to deal with this again. Don't lose heart. You can get by this and have a nice, healthy tank in the future.