Has your doctor check for mycobacteria? When I had this a few years ago, I just always felt like crap and tune-ups were not helping....my lung function just kept going down. There was no rhyme or reason and it turned out to be MAC, which is treated over 18-24 months of oral drugs.
What other bacteria do you grow? I am shocked that you are not on TOBI, Casyton or Colisten. Do you take oral antibiotics like zythromax or any anti-fungals like V-Fend (voriconizole)?
I am also surprised that you don't mention albuterol, or doing your Vest at least 2-3 times a day, as well as maybe getting some manual PT in there.
In my opinion, you should amp up your treatments to at least 2 x's if not 3 x's a day, increased nebs, and EXERCISE! My lung function is 25%, and I work out at least 3 x's a week for 45 minutes. Ya it sucks and ya it's hard, but it's increased my stamina and lung function by 3%. I'm still totally breathless but it keeps me STRONG. This may be why you don't have energy, because you stopped moving =) It's sooooo hard at first, but after time, you'll say to yourself "why the hell wasn't I doing this all along!"
Speak up at your clinic visits and insist your doctor take a more vested interest in your care! Only you can be your own advocate.
Good luck! Stay strong!