I used to have VCD which has disappeared since my tonsils were removed.
while I still occasionally have asthma problems. My very last VCD episode
occurred while in recovery from that surgery and the nurse thought I was
having an asthma attack - but I knew better. I can tell you for a fact that
if you have both asthma and VCD, you can tell the difference in an asthma
attack and VCD - you have only to pay attention. Someone posted years ago
that VCD is a caused by some kind of panic disorder, but when I did a search
of the latest literature, indicatitions were that they are relating it to
silent GERD at that point. Makes alot of sense to me based on my own
personal experience. My two remaining tonsils were still extremely swollen
until I was on prescription GERD med for months.

Also  alakeshwar, you should know that false positives on VCD vs. Asthma are
in the 30% range, so you have to really question a diagnosis that is based
on a meth challenge test. I have read article upon article about various
testing and there is always something new in that area as well. So although
my first set of tests indicated small airway disease, the most recent
literature now considers those results to be asthma. Like Doc00 says, if it
walks like a duck...........