Had a bad chest back in January/February, coughing so hard I was sick every morning and very sore, and was prescribed a ventolin inhaler and spacer. Use it once or twice since - when at altitude skiing for example. Now got a cough, starting to feel wheezy again and evry tired. Had a puff this morning but then thought is it likely to still be "good" and should I really be using it like this. Any advice please.