Hi Tom_Shannon
You are sounding desparate! Don't admit to being some form of fish doctor by any stretch, but thought I try help you out. Never tried it myself but the first book on aquariums/reef keeping I ever bought was "Aquariums for Dummies" :oops: It has a pretty good chapter on diseases and treatment.
There are two possible diseases that the book lists that may be what your damsel has - Marine white spot and marine velvet. Below are the symptoms and treatment for both - take your pick
Marine white spot
Symptoms: White spots resembling small grains of salt, appear on body
Treatment: Place the afflicted fish in a freshwater bath for a few minutes. Copper based medications are also effective (doesn't elaborate on this sorry)
Marine Velvet
Symptoms: White or rust coloured dust on the body and fin areas; fish is scratching by rubbing its body on the gravel, sand or decorations; increased respiration, excess slime, flared gills.
Treatment: Freshwater baths and copper-based medications
Hope this helps you out bit.
Cheers
Skippy