So sorry you are in this position..
It might be useful to know which bugs you have?
I have m abscessus and aspergillus and while it's theoretically resistant to everything, combining three ivs at a time still gives me some symptom control.There are a FEW new things in the pipeline if you can hang on in there - liposomal inhaled preparations,nitric acid, at trial stage and it may take a while before/if they become available. I also tried interferon gamma, even though I am not interferon gamma deficient , and it helped lengthen intervals between ivs. Worth exploring these options with your doc, but it does sound like they are trying hard to explore all options for you. Obviously, your drainage, exercise and nutrition are vitally important. Being in your situation might make you lack the motivation to attend to these things, but they really influence your outcome. Let us know what happens, I really hope they find something for you