Oh man, that's awful! I'm sorry this happened to you!! I will tell you that when I got the shingles vaccine, it's sicker from a vaccine than I've ever gotten. That was brutal! I only got sick from the first one and was after the second but gosh, wasn't expecting to feel so bad. they say that even that is a lot better than shingles.
So. you are basically getting returning sinusitis symptoms. My husband had sinus surgery and recurrent issues as well. He's a netty pot user and swears by it. Use distilled water (never tap). I see you have been using nasal rinses. That's good.
Have they determined what type of fungus you have? There are different types. Have they removed some of the mucus from your sinus to send to a lab and test it? This needs to be done. If it hasn't been done already, NEXT time, do this step. Important. They may do a CT of your sinuses to see if you have what is called a fungal ball. They may do a sinus endoscopy. These evaluations can help determine exactly what to do. Has any of this been done?
There are antifungal drugs. As in medications you take by mouth. That could alleviate he fungus. Keep doing the nasal washes they prescribe. Gulp . . . has anyone mentioned surgery?