This might be a bacterial infection type thing now. Im suggesting some sort of antibiotic (broad?), but cant recommend a perticular kind to you.. Sometimes fin rot will become more advanced.
Id say lower the tank temp a bit in the mean time, shove an airstone in if you have one, do a water change...
I dont think a fungus would cause this, btw. That medicine isnt really doing anything, I dont think.
Contact Oldfishlady right away, she's helped with this sort of thing before and can help with what to give. Other members may know, too, but try her first! She knows whats up. In your pm, please list all of the specs from your first post, tank size, temp, symptoms, etc.
Can we get a picture, too? That will help a ton. Putting the camera on macro (flower) setting will help quite a lot.
Good luck to you!