I was setting up an iPad Mini and it updated my iMac's OS. It reverted to 2011 and I have lost emails, desktop data and Adobe won't let me in to software. Help!

I was setting up an iPad Mini and it updated my iMac's OS. It reverted to 2011 and I have lost emails, desktop data and Adobe won't let me in to software. Help!

The iPad was plugged into the iMac to transfer apps etc and asked to update the macs OS. The result is that the last 12 months of emails have gone ( emails not working) as have whatever files were on the desktop. The calendar has also reverted to 2011.
Worse still is adobe software I use for work won't let me open.
Any ideas?

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