Your friend also had to literally clean up sh*t. Which no cushty perks of starting when you sign in or finishing when you've done your loos the right number of times can make up for being around that smell for more than 10 minutes at a time.
Thanks. It was a big scare, but made sense of how 'not right' I'd been feeling. Now it's just a case of being aware of blood sugar levels and ensuring not to spike them too high or have them drop too low. Most things at the festival should be fine in moderation!