The times and places I've been in CA, the break nurse or 'relief' always does your tasks while your on break, as they should. That is what they get paid to do and yes, it is also taking care of the patient. I'm not sure why you wouldn't want the relief to do their job or do what the patient needs done. I'm always grateful that they get blood sugars, give meds and turn my patients while I'm off the unit. That is what is appropriate. Secondly, I cannot imagine anyone 'yelling' at you for asking if your could go to lunch. Quite frankly, I cannot understand why you would have waited all day to ask to take your lunch or mention it. If I were the charge nurse, I might be frustrated by that as well because they want you to take your breaks. Sometimes they do not have time to swing by and ask each RN when they want to have their meal break. You need to speak up and stand some ground, it sounds like. Maybe try to speak to the nurses who you think are giving you a hard time. Difficult but you'll be glad you did...don't walk out of an assignment, that would not be in your best interest. Best of luck!!