iPhone Calendar Events Disappeared

Hello,

Most of my Calendar events recently disappeared off my iPhone 5. I recently updated to iOS 9.0.2, and I don't know if that could be what sparked it. Regardless, I've read other discussions from the support community, but I have been unsuccessful in getting the events back on my calendar. When I go to "Mail, Contacts, Calendars" under Settings, my Sync is already set to "All Events." Also, when I open my Calendar app, and select "Calendars" at the bottom, all calendars are being shown.

Please help!