Work like a fresh graduate........

I transferred and moved to HR for a week. Really work like a dog.......Everyday, i feel myself is totally exhausted. I started to recall the feeling of the first week in my working life......need to learn everything from the basic & beginning, always ask silly questions, need to re-confirm everything before reply e-mail to others, try to give out my best performance.....all make me feel exhausted.
When starting my second week in HR, I feel a bit better than last week. At least, I start to "grasp" the direction of work but my new boss is a very hard working and sometimes I think she just likes a workaholic. She works every Sat & Sun, though not a whole day but at least few hours. I am sometime scared by the number of e-mail received from her after the weekend......