Have they checked your sinuses? Sometimes sinus infections don't respond well to iv antibiotics, and can cause problems with your lungs getting continually reinfected (not to mention giving you a horrid cough from the garbage that goes down the back of your throat!). You can have bad sinuses without having a stuffy nose, etc.. Also, have you been checked for and are you doing anything for possible inflamation? Sometimes that can be an unending merry-go-round of coughing, but too tight to get anything up and out, sick more often, etc.. I take Advair, NAC (fizzy nac, lots of info here if you search it on the forums <img src="i/expressions/face-icon-small-wink.gif" border="0"> )and GSH (ditto), plus zithro 3 times a week for inflamation, plus keeping my blood sugar in check. You may want to ask to be checked for CFRD just in case. I hope you are feeling better soon.