I kinda feel your pain. The night before a race I was all amped up for (Jiminy Peak Road Race), I woke up at 2 a.m. and realized I was dehydrated as all hell when I went to the bathroom and was peeing dark yellow. Stupid mistake.
Ah well....always next year.
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2016 Trek 520 (54cm) touring bike for sale - never ridden. Message me for photos/details.