I was recently taken to hospital because of a faint and then a general feeling of light headedness, nausea and muscle weakness particularly in the legs. My pulse rate was 44 pm and my blood pressure was a little high but nothing to worry about. I also had a slightly raised temperature. I have left bundle branch block with no syptoms so far and a slight heart murmer which appears to be a lot easier to hear than 4 years ago. I have been referred to a cardiologist but wonder if anyone ealse has had LBBB with no symptoms then has developed into something similar. This episode was a week ago and although I felt great yesterday and the pulse rate had come up to 61, I feel dizzy again today and it is back to 44. I run 3 times a week but nothing too strenuous so I am no athlete. What do I do while I am waiting to see the cardiologist? Is it dangerous? If I feel well can I go for a run? My GP does not seem to know anything about this. I hope someone can help me.