You are definitely not alone. I've thought about quitting my job almost every day since starting. I switched to the night shift on my unit thinking that it would help and now I just feel drained and miserable on my days off. My heart rate is sky high and I'm sure my blood pressure is elevated too. I also have stomach issues. I get really sick to my stomach and feel like I want to throw up. Just thinking about going in makes me feel nauseated.
I watch the clock an hour before I have to get ready for work and dread every second. I've thought about calling out most days, but go in with the mind set that tonight won't be so bad. Some nights it's not, but for the most part I really hate working on the floor I'm on. After every shift I go home and search for another job. Clearly I'm not the only person on my floor who doesn't want to be there. Approximately 10 people have left since I started a year ago if that tells you anything.
I wouldn't go as far as to say this was the biggest mistake I every made, but it's in the top ten. I'm thinking about going back to school for a degree in something unrelated to nursing. We'll see.