After much soul searching I decided to quit my cushy staff job to pursue travel nursing. I wrote a very thoughtful letter of resignation and slipped it under my boss' door. I read online that it's not thoughtful to resign via email. My last day is October 1st and my first assignment starts on October 7th, (my flight to my assignment leaves on the 4th). I have been waiting for my boss to contact me about something, anything by now! I decided to reach out to her, and after a dozen unreturned phone calls and emails, I just found out she's been out for 3 weeks so she never got my letter (I work night shift so I go weeks without seeing my boss). She's scheduled to return on Monday but by then it'll be too late for a proper notice. What do I do now?