Bad Run :-(

There's a superstition in our group that everyone has one bad run in training, which means you've got it out of the way and that race day will be fine.  All rubbish of course but mentally it can help you recover from a bad session.  Well, today I had my bad run.
On paper the session didn't look too bad, especially after last week's tough one.  After warm up, we had 8 repetitions of 4 minutes at interval pace with one minute recoveries.  The problem started with the weather.  It was a gorgeous day - the warmest we've had so far.  Unfortunately the only time we could manage to get to the track was 11.30 in the morning.  In other words we were running at the hottest time of day.
The first 2 repetitions were fine but on the third, it felt as if I was dragging myself round.  When I slowed down for the recovery, I felt faint so took on some more water and slowed right down for the next repetition.  I felt like giving up on that one but somehow kept myself going.  Taking on the extra water just meant I could feel it swishing around in my stomach - yuck.  I also had a stitch in my right side.  Doing a couple of reps at a slowed down pace helped and by the 7th and 8th I was back up at a pace that felt reasonable (although not as fast as my first 2 reps).
Looking at my actual times when I'd finished, my slowest pace was on the 4th rep and was still 8:29 m/m.  The 5th was also slower at 8:24m/m but the rest were between 7:17 m/m and 8:14 m/m.  I had been aiming for 7:50m/m.  So aside from the heat, the other problem was going off too quickly at the start - hmmm, that old pacing problem again.
We had taken recovery drinks with us but it was only later, after a text from Karen, that I realised we hadn't stretched after the session!  Shows we weren't thinking straight afterwards.
The positives to take from it are that I finished it; the pace wasn't actually that slow; and if London is hot, we'll have had some warm weather training.