major error in NICU

I am totally down in the dumps. I have been an RN in pediatrics for almost nine years now. I have been working in NICU since last April. I made my first error the other night and I am on the verge of getting out of nursing or a major depression. maybe both. I reset an IV for a coworker (who has 25 years NICU experience). I was only going to put 50 ml in the buretrol b/c that is what I normally do for safety. I had the pump correctly set at that point. She asked me to put a hundred and was standing next to me. I accidently put 100 as the rate insead of 13.7. This was D17 TPN. The baby had about a 45 ml bolus before she caught it. He was very shaky and the glucose went sky high and then bottomed out but finally leveled out. He was already having glucose instability and very sick with meningitis. The NNP responded and tried to comfort me. I did the incident report and took full responsibility even though other nurse was standing there with me since I set the pump. The only blessing is that this was a term baby rather than a 600 gram preterm. In that case the baby might have died. I can't stop crying. I haven't heard anything from my boss yet, but I am sure the story is all over the unit. I was caring for the three intensive babies and so was my coworker. Staffing is not safe when our census is up, however I still messed up. I am wondering how to get over this or should I just find another job.