Were you using the Comcast page building tool? Or were you using some other tool and uploading your pages?
You viewed your web site, so this shouldn't be a caching problem in your web browser. But can you look at your pages with a different web browser while not logged in to verify that your changes are missing?
If they are still missing, contact Comcast and tell them that their personal web page building tool has corrupted your web pages. You need someone who understands the web page system to restore them.
If you had used a different system to build your previous pages and then used the Comcast tool to build new pages, when you saved your new pages created with the Comcast tool, your old pages would be hidden. To get them back, go to the File Manager (https://publish.comcast.net/filemanager/files/all/), find a file named indextimestamp.html (where timestamp is a date) and move it to index.html.
