IPhone/iMac sync problem following Yosemite update

I updated to Yosemite and have had multiple frustrating problems. The most recent one is that when I synced my iPhone after the update, almost every single entry disappeared from my calendar, causing me to miss an important appointment. When I compare my iMac calendar to the iPhone calendar now, I can see indications on the iPhone of items that correspond to the iMac items (little dot on the day on the monthly calendar), but when I click on the day there is absolutely nothing visible on the calendar. And obviously no reminders going off, causing missed appointments. On my iPhone calendar I have changed no settings at all following Yosemite update, and prior to update everything that was on my iMac calendar was showing on the iPhone. I don't do iCloud, I just sync by physically connecting the phone to the iMac.
My impression is overall that Apple is getting very lazy now that their market share is getting so huge. Yosemite update has been a disaster for me.

Sorry, on rereading I realise that the information is not completely clear. The items that are missing are on the iPhone calendar. The iMac calendar still has all the items that were on it before the Yosemite update. What has gone wrong is that somehow the phone calendar is not being updated properly at sync; for some weird reason the display (and reminders) on the phone calendar were wiped out with the sync to the iMac following the Yosemite update.

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