I'm so lost...

The OR is not for everyone. It seems you've figured out you're one of those it's not a fit for. If CRNA is what you want, then you're going to want to put yourself on track for that.

I would recommend speaking to your manager sooner rather than later. First of all, for your own mental well-being. If you are being stressed in the OR, you aren't going to be happy, which is going to affect performance which is going to affect teamwork and so on. Frankly, I have far more respect for the person who speaks up and says this isn't a fit and I need to find something else rather than the person who tries to stick it out but is miserable. In general, facilities are going to want to retain you, even if it means another orientation in another unit over losing you completely.

Are you currently on orientation? If so, be prepared to be told that you will no longer be orienting, and may need to use up accrued time off until they get you into a new position. It's the same for people who resign with notice while on orientation- the manager isn't going to continue to invest for negative return. However, with a good HR recruiter and manager to manager communication, that transition can happen as quickly as a few days. You don't want your manager to find out you're looking because the manager of the unit you applied to reached out to them- they won't have any motivation to help you. That's actually an exact scenario I'm seeing right now where I work- someone applied to another unit without telling anyone, and the manager basically pulled them into the office and sent them home until they find a new position.