Just suddenly stopped getting email, not sure why
Are you using webmail?
Do you get emails on another device besides your computer?
If webmail, are your folders full? [Click on the gear and you should be able to see what your usage is.]
@robdar follow this guide: https://www.xfinity.com/support/articles/spam-filters-and-email-blocking-new-experience
Under settings in "Filter Rules" check for any email filters. If you haven't changed your password recently, i highly recommend doing so and enabling two-factor authentication.