Hi Rahul, never ever over use your inhaler, as it will make your attack and asthma worse. Go see your Dr. immediately and try to change the inhaler to a different brand, obviously this one is not working for you. Ask him/her if you should also take pills to help you breathe, either SINGULAiRor something similar once in 24hr, and the inhaler. You should also have a rescue inhaler such as ALBUTEROL and use that only in emergency. I have posted a large post re: asthma and all, please read them, hope it will help you. Again do not overuse your inhalers. Keep an air cleaning machine in your home to filter out 99% of all polutants, you can get one for about $60.00 at K-mart or Sears. They help. Good luck.
salbutamol is albuterol --> just what they call it in Canada :)
If you only have the salbutamol, you need a steroid inhaler for daily use. Get an appointment within the next day or two with your doctor or go see a walk-in clinic. An increase use of a rescue medication (more than 3 times a week), indicates a need for a stronger medicine for a little while.
How you feel better soon!!