So, 6 weeks after fainting and having undergone mri, ct echo cardio and 24hr trace tests, I had a follow up appointment last night with my consultant. I was hugely relieved to hear that although a slight heart murmur was detected, the heart tests came back fine and my fainting episode is very unlikely to have been caused by heart issues. So I may well be one of those people who faints once in a life time..... Unless I faint again, no further investigations are going to be taking place. Fingers crossed! I can't drive till October , but am feeling much happier this morning. Having to walk 20 minutes to the station twice a day is only going to do me good.