Starving

So I work from 4:30 pm to 12:00 am. I get a 30 minute lunch break at 8:30 pm but I can’t seem to make it to 8:30 pm without feeling like I’m literally starving. I can’t eat snacks while I’m working because I answer phone calls and it would be a problem if I was chewing on someone’s ear because I don’t really get any warning before a call happens. I tried eating before starting work but I’m so hungry everyday to the point where it’s my lunch time and I’m so hungry I’m too nauseous to eat. 😭😭