Emails for eight day period have suddenly disappeared

When I opened my email software this morning, I noticed that all of my emails from 1/19/21 through 1/26/21 have disappeared. They are not in the trash or spam folders. I also logged into my email on the xfinity website and they are not in the trash folder there either. While the trash folder was selected, I clicked on the option to recover deleted emails, but none of them are showing up in the list, so it's not that they were accidentally deleted - they have simply disappeared.  All emails prior to 1/19/21 are still in my inbox.  It is just this eight day section that is gone. Any help would be appreciated.