Sigh, sounds familiar, unfortunately. You're in that situation where you're being "tested," it's sort of like RN boot camp, LOL. For some reason a lot of floors are like this - they totally torture the new people and anyone perceived as needing help - it's like being pecked to death by pigeons.
If it were me, knowing what I know now after 15 years' experience, I'd look for a different job. I would *definitely* ask a lot of questions at the interviews to determine whether the job is a good fit for YOU, too, not just whether you're a good fit for THEM. Do you get mentoring or preceptorship? A good place to work will offer a mentor to a new grad for a minimum of six months, and a year is better. What's the acuity / patient load like there? How do people team up to see that everyone gets care? I used to do "primary nursing," which basically meant that you, the RN, were responsible for that patient from arrival till departure. There were no aides or care assistants, you did everything from feeding and bathing and changing beds to planning care and running labs and complicated IV's and transfusions. BAD fit for me - this was an Ortho floor, most of our patients were total care people who were mobility compromised, I lasted two years but by the time I quit I was about half postal.
Different unit - Labor & Delivery. Usually one RN was in on each delivery, which sometimes meant chaos if baby was unexpectedly blue and mom hemorrhaged or something, but when I first started there we had an RT and anesthesiologist "on deck" in the hospital at all times. They brought an MBA in to "streamline" the unit, and that went out the window, along with allowing for two RN's in L&D at any given time. I ended up the only nurse back there one night with two ladies who were both set to deliver any second, no doc, no RT, and no additional hands. I put the patients on gurneys in toe hallway, delivered the first one, thanked goodness that she and baby were okay, and delivered the second one within about three minutes. All before anyone else could get there. Bad scene - I quit that job post- "streamline."
Now I do agency work. I sign up to work the shifts I want to work, the agency knows not to bug me about working extra or any other assorted nonsense, I get paid, and I'm done with it. My recruiter (they don't call them "supervisors" calls me to check on how a given shift went and if I was treated fairly by a facility, I get to go where I feel supported, it's nice. But I paid dues for a few years to get there.
Good luck - I really hope you find something you can live with soon!