I am treated for asthma with preventer inhaler. I rarely need to use reliever inhaler. I'm concerned that what I'm experiencing may not be asthma, although treatment works. When tested with peak-flow metre, the test has been OK. The 'asthma' attacks are very unpredictable and especially sudden. I don't wheeze. I am fine one minute and then suddenly all the tubes in my ears/sinuses 'seal up' and this sensation of swelling and blocking spreads to include lungs and I am gasping for air. The reliever does help me get back to normal after a few minutes. What I can't understand is why I don't wheeze, though I have had coughing/irritability of the lungs when not using the preventer. I also don't understand why these attacks are so sudden. Recently, I was shopping and decided to pop into a natural health products shop. I wasn't feeling stressed or anything. After literally one minute in the shop, I could feel the tubes sealing up and myself getting breathless. In the end I had to leave as I was struggling to talk. It seems that something in the shop set it off. This happens randomly in other places, and I have noticed it happen when a storm is approaching. This seems weird to me and doesn't sound like asthma. What do you think is happening? I have had skin allergies and my mother is very allergic to insect bites and suchlike - she also recently had an anaphylactic attack after a bone marrow biopsy (thankfully clear), so the family background is there.