Wow. I don't do second-hand recommendations often, but this one is too good to pass up.
Kendra (Preschoolers and Peace) pointed me at Copperswife. She has an amazing article on stress and homeschooling that should be required reading for every homeschooler. Seriously, it's that good.
Just to make absolutely sure you can get to it, I'm even listing the URL out. Go. Now. And then follow step #5 and stop reading blogs for the rest of the day! ;)
I just read her post and it sure was convicting. Especially the part about spending too much time on the computer. :-( I printed it out to read throughout the year to remind myself when things seem to get overwhelming.