First Time Fall

I've been a nurse for 3 years. I've never had a patient fall before. At shift change I got a quick update from the day shift nurse, he needed to go drop his labs off at the front, I told him to go. I would go check on the patient. I'd see him in a minute. I went to see the patient, asked if she needed anything, if she had to use the bathroom. She said no. I told her I would be right back. I went across the hall to introduce myself to the next patient. Told them I had not received report but that I would be back. Just wanted to say hello. I turned to leave and go back into the previous room and the patient hit her call button. I told her I was walking back that way, did she need to use the bathroom? She said she tried to go and she fell and that she needed help. PANIC. I ran in. She was on the floor and I reached down and picked her up. Pandemonium!!!! Long story short..she broke her hip. I assumed responsibility for the patient. I was the last one in the room. It was my fault. I feel horrible. I feel bad for that patient. I feel bad for myself. I had 5 patients. High acuity level on 3 different hallways. I always try to do things efficiently to get things started and taken care of because I know that I have a certain amount of time to get things done. I made mistakes and it was my fault she hurt herself. I should have just waited in the room to get report or found someone else who was ready to give me report. I should have checked the bed alarm. I didn't do those things and now my patient it hurt because of them. I can't eat. I can't sleep. I'm teary. This just happened so it's all still fresh. I don't know what is going to happen to me. I don't know what is going to happen to my poor patient. I should have said to the day shift nurse we need to give official report in the room. I should have persuaded her to use the bathroom when I was in there. I should have checked the bed alarm. Should have. Would have. Could have. I already had a conversation with my manager. I work nights and was sitting by the phone all morning because I knew she was going to call. I have to go to a meeting on Monday with the risk manager. This is a bit of a nightmare. I feel sick. How could I have been so careless! Rules are in place for a reason. I got an email saying 3 weeks ago I didn't document a bowel movement on a patient. One time. One patient. In 3 months. And I get an email stating what is expected of me and that I did not fulfill that obligation and that further incidences will have consequences. For not documenting a bowel movement. I can't even begin to think of what is going to happen that a patient under my care fell and broke a hip.