I am very worry!

I was worry about my shift swaping in the nursing home!
First, i am picking up esther's shift because she is going to melbourne for few days on sunday! And i am working on that day for a short shift actually.. she just ask me to pick up her shift and cancel my short shift! I am so scare that sth will go wrong! I have to explain to the nurses manager about that tomorrow！
Secondly, Ronald is dropping his "c" shift this coming thursday and he ask me to pick up his "c" shift because he is going to do esther's night shift on that day! so, the swaping form done! and i am going to pick the "c" shift!
Thirdly, Tomorrow, i am actually doing the long shift. But the RN called me to ask me to do the morning shift! And i was so blur and i told the RN that i am going to work tomorrow in the afternoon but he say i have no shift! I said," can u please check properly!" if not, i am going to die! He told me that someone cancel my long shift and i didn't know that! I hope there's someone coming tomorrow or else.. I will be blamed!
*SIGH*
*Hope everything going smooth!**
I am very scare something will happen to me!