This just happened to my poor fellow background singer for a live show we were doing last night. Here's what worked for her:
- Checked in with bandmates who connected her to her employer who called in a hotel doc.
- Got some prescription meds (never take a prescription drug without asking your doc- it could kill you and it's hard to sing dead) phenergan worked for her.
- Finally got some liquid down (soup worked for her).
- Skipped sound check and slept.
- Made the gig. Didn't dance a lot.