Yeah what Royal Prince said. The chances of him giving you the ok to neb OO is as likely as you walking outside and seeing King Kong in your front yard fighting with a T-Rex. I had to take the initiative/chance myself, and only after how he saw how I was doing, and asked what I have been doing different, did he basically give me the nob to "Keep on doing whatever it is I have been doing". I am still a great believer in the substance, and i'm still doing amazing on the substance. It has allowed me to fully go back to work, and work harder and longer (walking atleast 8-9 miles a shift) than I have ever been able to do in my entire life, with as close to zero symptoms of CF showing. My only problem now is (and it's not related to OO), is the sinuses in the back right of my head (right above my neck) are giving me problems, and i'm battling them with ibuprofen, and NAC, rhinocort, and zyrtec. Seems the rhinocort has the strongest positive impact on it. After every shift (atleast 8 hours of busting my hiney hole), I get a headache back in that area. I could be more proactive sinus wise and do real rinses and stuff, but it's hard because i want to go to bed and I have zero congestion evident in my sinuses, it's just that damn headache that pops up here and there after work or sometimes when i'm drinking.
Anyways, back on topic. Just do your own research, keep an ear open to what doc has to say, but don't look forward to the green light from him or anything positive. If after all the research you do, if you still choose to give it a trial period of a month of nebbing the water soluble stuff (I recommend giving it atleast a month of a real chance), and you start to feel much better, look at it like you have found a real nice supplement to help greatly ease your CF symptoms. So far, judging by what others have reported, and that most are still using it in various forms, it has a much higher chance of helping you rather than harming you.
Remember, the strength of OO isn't just in it's antimicrobial properties, it's also in it's EXTREMELY powerful antiinflamatory properties, so that helps us massively as well.
