I have been there and taken that as far as inhalers are concerned... I even remember life before inhalers :/
I went to my local hospital chest clinic a year ago and the consultant prescribed a new powder inhaler called Anoro Ellipta.
I take one inhalation each morning and to be honest Asthma is kept well at bay these days. (Except for right now). Every GP has not heard of the inhaler and I usually have to explain what it is ... "google it"
The consultant was also an asthmatic and I asked if there was anything he could recommend that would help my continual catching of colds. He mentioned Vitamin C and Zinc from Boots. So I bought some and I have to say the colds have been much less often now.