Hmmm... last week on Ride the Rockies, I had what might have been this situation. Every morning, I would hit the continental breakfast, load up on high-sugar stuff and within 15 minutes be on the road, nauseous, bloated, and just feeling like crap. When I'm home, I usually have a bagel on the drive to my weekend rides, but that's usually 30 minutes before I start riding.
I wonder if this could be my problem. I'm doing another weeklong tour in Colorado in August and was going to experiment with just skipping breakfast and going with my Sustained or Perpeteum bottles instead.
For 3 days, I get to part of a thousand other journeys.