Would much harder would it be for most people to maintain a strict diet/lifestyle if they had a stressful job?

I've got fibromyalgia and pretty severe dietary strictures, like no gluten, no lactose, no junk food, and no sugar. I find that my self-care falls apart reliably based on the stress level of where I make money (my job). How should I feel about this? How should I approach this? P.S. Of course, employers don't care.