Re: Cough for FOUR MONTHS
Chronic cough can be difficult to pin down and get accurate diagnosis. Do you have any symptoms of wheezing or shortness of breath along with the cough? While you could just have a cough-variant asthma, typically you would also experience shortness of breathe and wheezing. I have personal experience with cough-variant asthma and I can tell you that no amount of the normally-prescribed cough medicine could control it. Tessalon pearles were like eating skittles. The only type of cough syrup that helps me is something with hydrocodone, which is now limited to one type of very expensive cough syrup that also contains a decongestant.
Reflux is also worth checking into. Could be acidic or non-acidic reflux. Silent reflux can be big contributor to chronic cough, where you may not have noticeable symptoms except for the cough. A 24-hour pH impedence test is the gold standard for diagnosing.
Upper airway cough syndrome is another possibility. Do you have any nasal congestion?
You will have to go off your asthma meds to do the methacoline challenge, so it will be interesting to see if your PFTs change even in pre-test being off the meds. I would definitely keep the appointment for the challenge. If you do not respond, then I would start pushing hard for more answers. Prednisone is nasty stuff and horrible medicine to be on for any length of time. Not just the weight gain, but cataracts, bone loss, immune issues, etc. It basically speeds up the aging process in your body. I also always have terrible withdrawal symptoms, horrible muscle aches, depression, mood changes, etc.
Finally, some other questions to consider: Is your cough productive? Do you bring anything up? If you cough up mucous is it clear or colored? If it is productive cough, definitely get the sputum cultured, as you could have slow-growing lung bacteria creating the cough. Have you been tested for aspergillus?