I had that from NHS Direct last year... I was fairly newly disabled, and had tightness in my chest and shortness of breath. Website said "call NHS Direct" so I did, thinking maybe they would, I dunno, tell me some stretches to do or something. Next thing I knew there was a 999 operator on the line who was telling me to stay as calm as possible, secure any pets in the bathroom, and could I send someone outside to wave? I was on my own? Well could I prop open the front door? Within minutes, two ambulance people were lugging heavy bags of equipment up the stairs to my flat and me saying "I'm really sorry..."