To be a nurse or not?

Well, here's the thing. Any job is going to have issues and stress. So in that sense, no, you aren't going to escape it, even if you leave nursing to do something as different from nursing as, say, accounting.

That being said, intermediate units are an incredible place to cut your teeth. You have much of the acuity of the ICU but need the ability to prioritize and time manage like a med-surg unit. You have a year in and it is probably about to get much better. I would advise not to jump ship completely. If you can't take another year where you are, then start feeling around for a different specialty. Maybe a women's unit would suit you, or being a clinic nurse. Maybe you would like a shot at something different. The nice thing about Progressive Care experience is that it is applicable to many other specialties. Not always enough to get your foot in the door, but often enough to get looked over as a potential.

One job for one year isn't enough experience to dismiss the career entirely. I would suggest you either stick it out another six months and re-evaluate how you feel about your practice then, or start nosing around for something in a different specialty with a different type of population. You never know what you might find.