Holy crap! I'm glad those people finally figured out what was wrong and I'm glad you're recovering, at last. Wishing you a speedy recovery.
(Warning: this may be too gross for some) But I'm very interested in this because I had sinus surgery about 6 months ago (I think, I'm bad with time and my memory stinks) and I only recently stopped blowing out huge leathery scabs, usually from my left nostril. I recently got another crazy sinus infection and, this time, my doctor put me on heavy duty antibiotics, since it turned into pneumonia the last time it happened. I just realized I haven't blown out a leathery scab since I finished the pills about a week ago so, hopefully, everything's under control now... I'll be paying close attention for the next several weeks but this is the longest I've gone without any signs of trouble since I had my surgery. Really, every day I'd be blowing, blowing, blowing hard because I could feel something wanting to come out. And once it finally did it would be a huge, hard mass. It was awful but not like what you've experienced.