newnurse0

OK, so I just started as a new grad on my unit in May as a casual. My educator told me that as a casual, I should be trying to pick up as close to full time as possible for the first year in order to get the swing of the unit. I book most of my shifts in advance, and I book about 60-68 hours per pay period (0.75-0.85 FTE) in advance. My issue is, I keep getting called last minute (literally almost every day), and I feel insanely guilty when I say no to them (which is pretty often). The reason I say no so often is because I have already been feeling incredibly tired and burnt out. It's a busy and chaotic unit and we are often working short staffed, and I have come home from shifts in tears multiple times already. I feel like I don't function as well when I pick up to full time, and then my patient care suffers and I get even more stressed out. When I come home from work I feel like I made the wrong choice to be a nurse because I am so stressed out and I don't know if I can handle this for the rest of my life. My question is, should I be feeling guilty for saying no? And if not, how do you get rid of that guilt that comes with every time I say no to staffing?