I've just come back from 4 weeks walking and exploring in N Wales, taking lots of walks on my own in the hills, and feeling fit and well. 4 days after getting back, I had an episode of high pulse rate (130-150) went to the GP and ended up in an emergency ambulance to hospital. I've been diagnosed with super ventricular tachycardia, atrial fibrillation and hypercalcaemia (too much calcium in my blood, and the possible cause of the heart irregularities). I'm waiting for outpatients appointments, and in the meantime am not quite sure what I should be doing. I live on my own, like to walk on my own, enjoy countryside conservation work parties. Is exercise good or bad for me? Any advice on anything welcome!!