I second @Rose_Queen. The OR isn't necessarily predictable or boring and I have found most of the time it is neither. A same day/ambulatory surgery center may be more so of those things, but ASCs are typically very fast paced and I wouldn't say "boring." As Rose Queen said, working in the OR you never know what you are walking into when you come in for your shift. Emergent hearts, cranis, bowel perforations, depending on what level trauma center you are at you may be getting gunshot wound victims. Many of us take call as well and are expected to come in if needed in the middle of night where you have very limited resources and are expected to know what you are doing and handle anything that occurs. I love working in the OR but it was a steep learning curve for me, especially coming from the floor. It is hard to be successful without completely a peri-operative education program like Peri-op 101 without having any prior OR experience.
If the ICU isn't for you, that's okay. If you feel like you need boring and predictable, thats okay too. But maybe you are just overwhelmed, overstimulated, and just not vibing with your current position and maybe you don't need "boring" and "predictable." Sometimes just getting away from your current position and into something that better fits your work style, personality, life style, and just general interests will be what gets you feeling more comfortable.
I wanna end with although I know it gets old hearing "give it time" sometimes time does help. Anything new is overwhelming and as nurses we inherently want to do a great job and know everything and be masters at our craft. That comes with time and experience and it helps to have a working environment nurturing of that.
Best of luck to you in your future endeavors.