Thanks for reaching out! I'm sorry that you are experiencing trouble with this. Are you sure that you made these edits on the same document? Have you looked in other documents on your account?
I also recommend checking out your revision history, as this will allow you to restore to a previous version of your document.
If this does not help you recover your work, please contact us here so that we can troubleshoot this more individually, and please include the URL to your document as well as a screenshot of what you are seeing.