Return from mat leave with only 6 months experience

I am hoping someone out there can relate to me. I graduated only 1 1/2 years ago, however, after 6 months of practice I was off on maternity leave. I took the full year (am here in Canada) but have recently returned to work. I was on an adult medical floor, but thought after the year that I wanted to switch to post partum, which is something that I have always wanted to try. I started on my new unit this past week, however I am finding it so difficult and so hard after being off for a year. I find that I have trouble retaining information, I feel inadequate, I feel nervous and I am full of self doubt. I feel like a fraud. Has anyone else had difficulty after returning to work after an absence. My confidence is shaken and I am having trouble dealing with the transition.....I need the job though.......I feel like a scared nervous wreck.....any words of advice??? Thanks for the help...