I have fainted twice in twenty-seven years. Once when I came to conclusion my ankle was no longer attached to my lower leg which was no longer attached to my upper leg and realised it was rather painful. The second time was yesterday, only this time I have no idea why it happened.

I was on my way to work and while walking to Canary Wharf tube station I started to get hot, despite it being chilly at that time in the morning. I felt like I was about to throw up - something which I haven't done since I was twelve - and black spots appeared in front of my eyes.

I told myself it would be alright and headed for the ticket barriers. And then it all went black...

A few minutes - or at least I think it was a few minutes later - I open my eyes to find myself being surrounded by London Underground staff who informed me I fainted. Though I had hit my head on the floor, a man behind me had tried to stop me from falling and it probably helped break the fall slightly for which I thanked him.

I got taken to the staff room where a medic arrived to check me out. I was put in a taxi and was sent on my way to the hospital where I spent the next three hours under observation. I was finally allowed home and went straight to bed.

Strange...the doctors didn't find anything obvious and though I have been quite tired of late, my overall health has been fine. I hope it doesn't happen again.

Was greeted by the staff at Canary Wharf tube station this morning, they now all seem to know my name...at least that makes the journey slightly more pleasant.

Ilse