[JRutherford]

First thing, relax! As others have pointed out, this won't be the first time that someone has quit a job without notice.

In the early 90s, right out of college, I was sent to a godawful temp assignment in Austin, Texas. The temp agency told me multiple times, "Call us when you arrive." I arrived at the job, and the company didn't have a phone that employees could use. They directed me to a payphone in the lunch room. At the lunch break, I left the building and drove home. I called the temp agency to let them know I wasn't going back. They were pissed.

As others have said, I would be professional. Don't just disappear. Call, email, speak with both bosses and explain you've got personal issues. If you possibly can, work two weeks. If not, let them know you can't.

Good luck!!