Your doctor may prescribe things for you to use against what seems to be mild asthma which may not be too good for you in the long run. The Buteyko method is proven, safe and very effective. The book Close Your Mouth and ABC to be asthma free are self help books to teach yourself the Buteykjo clinic method. They are available from
http://www.amazon.com for USA and amazon.co.uk for UK and other countries. Patrick McKeown a renowned practitioner teaches many other natural clinic methods at his site
http://www.asthmacare.ie It will be well worth your time.
