I had a histamine challenge a couple of days ago and had a reaction on the 2nd dose, does this mean I definately have asthma? I've had symptoms for 6 years and been treated as having asthma but due to not being controlled during this time, 1 hospital told me it was psychological and another told me they thought I was making it up. Now a 3rd hospital has performed the histamine challenge and could see my reaction I am unsure of how to feel - do I definately have asthma? will people now believe me???