Hello,
Thank you for asking at HCM.
I went through your history and would like to make suggestions for you as follows:
1. As your symptoms started after inhalation of sawdust, it is the most probable cause that triggered 
asthma symptoms.
2. I usually prescribe my such patients salbutamol or 
levosalbutamol inhaler frequently during day until symptoms subside.
3. If using inhaler does not help or breathing difficulty persists, I would suggest you to consult your physician who will examine your chest with stethoscope and may prescribe you 
steroids for relief from severe symptoms.
4. Please make sure you are taking adequate warm liquids during day to maintain hydration.
5. Please avoid exposure to dusts, smokes and air pollution as much as possible.
Hope above suggestions will be helpful to you.
Should you have any further query, please feel free to ask at HCM.
Wish you the best of the health ahead.
Thank you & Regards.