Gosh, don't feel like a failure. Consider this a learning experience and will therefore be very helpful for you. You already seemed to have targeted where things went wrong in addition to an air quality alert day. As for pre-ride food and during the ride food it will just be trial and error with protein/carbs. I typically carry some sort of gel and at least one bottle of electrolyte with nutrition such as Cytomax for rides 40 miles or less and another bottle of just water or electrolyte. But this seems to be an atypical experience for you - you did say you ate, and that you might have had too much libation the night before so maybe your system was just off. We certainly all have those days. Or the timing of your eating wasn't quite right after that kind of a night.