Night shift tips

Av
I'm 9 weeks pregnant and do night shifts at an old aged home from 11pm-7am 
I sleep as much as I can and my morning sickness is easing but I still feel terrible, I can barely eat at work or stay awake 
Anyone done this and have any tips or good foods?
I've tried so many things and still struggling!
I take my ondanstaron during the day when my morning sickness is worse and can only take one so I can't take it again unless I was to completely change my routine. I've tried Maxalon and it just completely knocks me out 
Please tell me there's a secret to this! 😭