Bex, I haven't been there, but can you imagine the trouble that gangrene in your jaw could be doing? If you have gangrene in your foot, it will KILL YOU if you don't have your foot amputated in time. Gangrene, like the anaerobic bacteria in your jaw, can be deadly. Just think of botulismn. The bacteria which causes this is not too bad, until it grows under anaerobic conditions. Then it becomes potent and deadly. Get your jaw cavitations cleaned out.
DON'T DELAY!!
And then get compatible tooth materials placed. I am no expert, but I wouldn't be surprised if the jaw cavitation is the source of your problems, from all that I've read.