My guess is the stress of the differing schedules is throwing off your body. I've never worked shifts, but when I was in grad school, my schedules were all over the place between classes, interning and homework. My IBS would often flare when I wasn't taking good care of myself, eating bad or not getting enough sleep. Just try to eat as safely as possible, drink plenty of water, get plenty of rest and if you get D, take some Immodium before your shift.
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Re: Shift work- replies would be much appreciated :)
