I think the head dipping thing would cause another problem - but FIRST I need to rule out the hydration pack as the cause of the problem. Sunday morning is an intense conditioning group training session so I don't normally ride on Sundays. However, unless we do a lot of deadlifting or overhead work today I will get the bike out this evening for a gentle ride and just take a water bottle/stop when I need to drink. From what I've been able to tell the intensity of the ride isn't related to the onset of my symptoms so a gentle ride should tell me something.

I SO wish I lived close to Wahine or Knotted!