I was diagnosed with asthma in February of this year. In April the brown inhaler wasn't working too great so I was put on a higher dose of flutiform. My symptoms have hugely reduced since then, however recently I've developed a cold that won't go away. It's turned into a rattley cough and although I don't feel very unwell otherwise, I'm not sure if it's the start or a chest infection or an asthma flare up. should I go to the doctor anyway?