I've had a pretty rough few months since moving from clenil (steroid only) to seretide, then symbicort, both of which contain a long acting beta agonist. I've been back on the clenil for about 10days and feel a bit better, so my GP is working on the assumption I may be sensitive to the LABAs. I'm wondering how common this is? The asthma has been fairly well controlled for about about a month or so, but I'm left with sob at the slightest bit of exertion. This has improved a bit on the clenil and the GP is hoping it'll carry on improving as the clenil continues to kick in over the next month. I've also just found out I'm vitamin D deficient - not sure how relevant that is, but thought I'd throw it in there just in case.