Had AF diagnosed this march, had previously been treated for SVT, with Bisoprolol for some years now. Have had a few major episodes, one ended in overnight stay in hospital. Getting breathless on and off now, also getting a bit lightheaded now and again. But my pulse feels pretty regular to me. Is this a sign of a worsening condition? Will be having ILR fitted soon. Would appreciate your thoughts. This is such an informative site, very helpful.