JG I would be ringing back and stressing that you MUST see her tomorrow, you can come in early or late in the day if it's going to be easier for her to see you then but it's of utmost importance. Keep ringing back every hour or so until they confirm an appt time. I used to work as a medical receptionist and trust me this strategy will work. Repeat each time you ring that it's URGENT and IMPORTANT. Good luck.