I’m experiencing a similar issue, but my Jetpack wasn’t expired. It stopped connecting to WordPress and when I went through the troubleshooting steps and tried disconnecting then reconnecting Jetpack, it wouldn’t let me reconnect and my site disappeared from my admin tab on WordPress. It came back after I tried to reconnect Jetpack several times and it finally reconnected. However, Jetpack is still not connecting to my WordPress and I’m afraid to disconnect it again given what happened last time.