Good advice on meal prep, and don't forget snacks (read fruit and veg).
But what sort of work is it? If you are a desk jockey then you just have to eat and work. If you work a sales type job, quit and get a real one

, or look to have more snack type foods that won't cause an issue, and shakes that can be in a drink container to sip. If its construction/labour, get your union onto it and you'll have all your smoko breaks back.
For non-aussies/kiwis Smoko=tea/coffee break.