hello welcome to healthcare magic,
as you said you work in shifts,do the shifts change daily or on weekly,monthly basis?
if they chang after a duration of time you can fix your timetable according to the work,try keeping the meal times the same.the quantity of meals can be adjusted according to the appetite.
also sleep deprivation
is an important cause for body pain
.Try to get 7-8 hours of sleep daily.night sleep is best for the body.
regular head and feet massage
with medicated oil is highly benificial.