Darren Day, 57, was taken to A&E on Good Friday, just hours before he was due to perform in a pantomime production of Mother Goose at the Roses Theatre in Tewkesbury.
The singer posted on Instagram that he had suspected broken bones in his wrist and elbow and was awaiting treatment with just over an hour until curtain up.
Fellow cast member Helen Flanagan and singer Debbie Gibson sent support in the comments, while Gemma Collins, his former Celebrity Big Brother housemate, wrote: 'I'm claustrophobic, Darren!' in reference to their time on the show.
Fans also sent well-wishes, with one writing: 'Oh no, here's hoping it's not as bad as you think.'
This comes shortly after Day became a grandfather to grandson Colton, with whom he posed alongside ex-partner Suzanne Shaw. Shaw posted a tribute to the newborn, saying she was 'lost in pure love'.
Day and Shaw dated in 2003 and had son Corey before splitting in 2005. Shaw recently separated from her long-term partner Sam after 12 years together.
