Just came back from the docs. He prescribed Salmeterol last Friday, but by Sunday I was having worse attacks, dizzines and nausea, so went back today. He took me straight off it. These are rare side effects (less than 1 in 10000 people experience them apparently).
I'm now on a doubled up dose of Beclometasone, and got 10 days worth of Prednisolone and going back for a review in 2 days.
As is always the case, I was absolutely fine all the time I was in the Doctor's surgery and waiting room.