The calendar on my iPhone 4s suddenly went blank and says NoEvents anywhere. What happened and how do I get the information back?

The calendar on my iPhone 42 suddenly went blank and says No Events. How do I get my data back?

I've been having the same problem every 3-4 months: the calendar app seems to hang up, I either reset the app/phone or wait it out, then presto! all internal calendar entries have been deleted. Unlike others in this thread and elsewhere, I am not using iCloud.
Interesting fact: while following the suggestion to hide all calendars, then show all calendars, I noticed that the internal calendar option is MISSING. It's like it just doesn't identify that there ever WAS an internal calendar. Really? Argh.
Apple Support: are you guys monitoring this? I've seen a few similar postings, so I don't think we're alone...
Granted, I have more than a few entries - years of calendar/appointment history have been imported from my old Palm Treo. Thanks to slow performance and odd calendar app crashes, I am very well aware that the iPhone's calendar isn't nearly up to the task of handling this many entries, and have been working to get the quantity of entries down. I must be up near some threshold, as response time seems to have improved with several deleted entries, though it was just before the crash+data loss.
Fortunately, I try to sync with my Outlook calendar nightly, so I do have a backup. However, this type of data loss and instability re VERY painful for those that actually USE and practically LIVE by their calendars. Here's hoping I can remember today's entry modifications...
One additional complaint: WHY can't I edit a recurring appointment WITHOUT it creating a NEW one? Crazy... For all the things this smartphone does well, it does several things VERY stupidly.
_Dave_

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