I've been on Tobi inhalation nabbing since last October for Pseudomonas a. in lungs. It has been hard to take for me, but hopefully it is helping. I discovered the inhaler itself was causing many problems and I just received a Pari LC Plus device which makes the whole process much more tolerable. I do cough a lot with it, but I guess to be expected. Mine is covered mostly so cost is also tolerable.
I CAN tell you, it gets easier. My first few months were very hard to tolerate but last month with the new Pari has been much better, so hoping for an easier time. Good luck to you and keep at it.