Im 37yrs Male I Have Asthama From My Childhood, 20yrs

Im 37yrs male i have asthama from my childhood, 20yrs back asthama was increased more and doctor priscribed me salbutamol inhaler, wysolon, deriphyllin tab. But 10yrs back it become more and once admitted & priscribed with adittional inhaler seroflo 250, i use to take if i feel more wheezing only in winter, if not i use to take salbutamol inhaler only. Now my doubt is I have to take it regulary r only in winter is it ok pls clarify me. How long & how should i take...