Hi thanks for asking question.
Asthma diagnosis confirm by
spirometry that is pulmonary function test.
You might have seasonal asthma.
When winter season start you can start simple
budesonide 400 mg containing meterd dose inhalor once a day.
If eosinophil high hetrazane can given.
As preventive aspect leukotrien antagonist like
montelukast can be given.
If prevalence of influenza more in your area then vaccine can be given.
Meanwhile if severe difficult breathing occur by
bronchoconstriction then nebulization by
levosalbutamol and budesonide respule done.
Room heater can be used in winter.
Steam inhalation is good.
No further aggressive treatment needed just now.
In asthma garlic , ginger and eucalyptus is very useful.
Wish you good health.
Dr.Parth goswami