have a look at this thread while we're waiting for one of the emergency care experts to chime in
https://www.backyardchickens.com/threads/how-to-provide-emergency-and-supportive-care-updated-01-17-2021.1048620/
Perhaps one of @azygous @casportpony @coach723 @dawg53 @Eggcessive or @Wyorp...