Will Falconer, DVM Moderator
Hi Jessica,
The first place is to learn about and stop vaccinations. She's done. For life. Any more will worsen what you see now. Search on that word on the search box I have on every page and start absorbing that information. Literally, the most important decision you'll make in her life.
Then, get off the pesticides for fleas and heartworm. I address both of these in the links in the last sentence.
Finally, get a veterinary homeopath hired to help you cure this. Once cured, the homeopathic prescribing stops and you keep her out of trouble by avoiding #1 and #2 above. My Resources page has the AVH list on it to help you find someone to help you.
This is curable, but not DIY. It's chronic disease and takes careful management to get to cure. That's part of our training and experience.