I know so many of us have been where you are and our hearts are with you.
Here is a link to my blog that will be useful http://www.polyamorouspeople.com/2010/07/jealousy.html
. This was my first experience alone for a weekend when Z went to stay with his SO. Unlike you I hadn't done any preparation, so I was pretty much a complete wreck. But I survived and I agree with the advice you have been given previously. There is no point making it any harder for yourself than you have to.
While you're there check out the post "The Polyamory Garden Shed" it's under favorites and has a neat video on it about being alone that I find immensely comforting.