Looking for Advice

I posted today on This Must Be Thursday, a blog I co-author with a close friend and colleague. I wrote the post for the cathartic qualities involved in getting emotions out on the page. However, in the process and since I've been mulling the big questions in it. And I'd love to know what others think.

The main questions were

So, what is my responsibility? Should my students be completely unaware of issues I face? Should they know if I'm having a bad day? Does their age matter, older students being more able to deal with understanding their teacher's mood swings or such? Is it my job to teach my students well regardless?

I haven't really been able to figure out where I stand on this and I'm hoping for some thought-provoking ideas.