I can only say what others have said - quit now!
Your situation is almost identical to my husband's two years ago, except he was in retail pharmacy, not hospital. We called it the "WalMartization" of health care. New grads make 20% less than old hires, and also rarely get full time now. They are forced to work at least 2 jobs to make up enough hours, and do not get benefits. Management wants only new hires, and wants all the old guys to disappear. They treat all staff horribly, and so do the customers. He was actually getting physically ill every day before he went to work, but couldn't seem to just quit. Finally, things came to a head, and he walked out. Best decision ever! He still wanted to work some, so put his name in with a relief company. He had more offers of work than he could handle, and was able to structure his days and weeks exactly how he wanted. Need vacation time? Just block those weeks off. If a relief posting wasn't pleasant, he just refused to ever work for them again. Stress levels went down, happiness went up, and it's a great way to transition to full retirement. He didn't need to work financially, but wasn't ready to give it all up yet. He used to love being a pharmacist - I bet you did too. Now he's down to one day a week, and will quit even that in a few months. He wonders why he didn't do it sooner.