I have a virus and went to the doctor and she gave me a blue (salamol) inhaler. I have to take two puffs twice a day, but I am new at taking my inhaler so it makes me feel weird. My heart beats faster and I feel shaky. I want to know how long the inhaler will last for as every time I use it I feel that it is empty. I would also like to know how I can get another inhaler without needing a prescription. And finally I would like some tips on how to get used to using my new inhaler. Thank you.