IPhone automatically cleared calendar, need month events back?

Realised my phone was set to sync my calendar monthly, I've now changed my sync option to 6months but I'm still having trouble finding my may2013 month event, surely it's somewhere, my iPhone/iPad has always been linked to iCloud so would it be there and if so how do I get it? Desperate to get my old events back, any help much appreciated

You can go to http://www.icloud.com/...icloud.com and it will show you what files you have backed up and you should be able to view it there.