Dialysis clinics are rough even for seasoned nurses; there is very little flexibility in how things are scheduled - which is understandable, given the nature of the clinic, but it's a rough start for a new nurse.
Your health is not more important than your career, and if a job is affecting both your mental and physical health, you should be considering alternative jobs at this point. But that's just my opinion
I come home from work tired and exhausted, but I look forward to going in the next day and most of the time, my job doesn't affect my personal life (granted, like anyone, some deaths get to me and some days get to me). When I had job that took over my home life - whether it was from being upset at what happened regularly, working too much, or having unsupportive bosses - I looked elsewhere.
I realize that's not a step everyone can take, and I realize it's not always realistic. But never underprioritize your own health.