I had an issue where an ingredient in a smoothie I was drinking in the morning was making me sick... since there were several ingredients it took me a couple of times to realize what was causing it, but I wound up getting sick at work twice after I'd biked in. It wasn't too bad... once I hurled I felt a lot better. The first time I didn't tell anyone and just gutted out the day, and by the time I had to leave I felt fine enough to bike home. The second time I wasn't able to keep it under wraps and I was sent home. I couldn't find anyone available to give me a ride, so I finally rode to the light rail station to cut some mileage off the commute. I still had to ride 5.5 miles to get home, and I was still feeling pretty week... but I just rode real slow. Not sure what I'd do if I was too sick to ride back. I'd assume my employer would be okay with me storing my bike somewhere inside overnight, and I'd probably try a lot harder to get a ride, but those without the option of storing inside overnight and limited transportation options would really be in a bind.