That sucks. I wish I knew what to tell you. There is an entire aresenal out there that can help you, but it seems as if you've tried so much of it. OP has it's limitations, I'm sure of that. The essential oils, Tea Tree, Peppermint, Clove and Oil of Oregano are the best of the best to fight infections. Have you tried Iodine? I would think that swishing with some Iodine would be the ultimate.
I know how frustrated you are and I feel frustrated with you.