You will be fine, the more you work there, the more experienced you will be. Consider it a blessing to know you have given the best care you can for a person and you work your hardest to save these people's lives. If you have to go into the bathroom and cry do this, never get so used to ICU where your feelings become null and void. Take it from me I see it a lot working in the ICU as a nurse tech. Besides even when you feel like your best isn't enough people look up to you like the aides, techs, the families, and even though they may not be able to tell you the patients