Hello @JohnC3266 ,
Did you receive any error messages or were there any internet connection issues when editing the email? I checked with our higher level technical team, unfortunately they aren't able to rewind campaigns. At this point the only option is to retype the text.
If you did get an error message or if our system indicated any reason why it wouldn't have saved the text, please let us know. That way we can provide that feedback to our engineers for further review.