I found the above comments very interesting as I am scheduled for the Metacholine Challenge. However, I may have to postpone again with my fall allergies being severe even with Zyrtec and Benadryl. (Last time I withdrew Zyrtec for 3 days I broke out in hives from my head to my toes!) My pulmonary specialist thinks I may have vocal chord dysfunction, with anxiety being a possible issue. He feels speech therapy may also help. However, he wants to rule out asthma first. I also feel that I do have asthma, having had shortness of breath as a child, especially on hot/humid days. Pregnancy was especially difficult. I have chronic cough everyday, triggered by anything or nothing: breathing in "wrong" (how does one do that?), giggling, the 1st taste of any/many foods, stress, smell of something strong, smoke, a turn of my head up or sideways, etc. Sometimes muscles constrict in the throat and I cannot get any air at all and have turned gray...an anaphylactic reaction. (Of course, these are worsened if I have a cold.) Please tell me if anyone has had these symptoms!