When one takes steroids yes it helps. But then the body stops making its own natural steroids so if you dont cut down slowly back off it once your better, than the body has no steroids and you feel tight in the chest. Steroids are an anti inflammatory. Doctors dont tell people why to reduce it slowly they just give drugs to better your situation. My advice now is to slowly try and reduce the amount after treating the asthma. Im currently on Flixotide 125 2 puffs a day and I have slowly reduced myself. But make sure you exercise your lungs everyday to get a larger capacity. If you are allergic you should get a pricktest allergy done. Get a referral from the doctor. You can only avoid the allergens. Than you can also try allergy desensitisation as well.
Cheers good luck Seanine