I have been having issues in ical I have been saving events on 1 device & it has been getting over written & deleted by my other device.

I've got an iMac & an iPhone 5. I have been having issues when I have been saving events on 1 device & it has been getting over written & deleted by other device. Up until now it had been items that were not hugely important until now!!! I have a daily repeated event that I update on a Dailey basis so that I can keep a record of events for my job so that I can compile a report. The daily event is still in both diaries but any extra info that has been put in has been lost? So I have lost a month & a half a worth of data!!!

Does anyone know if there is a way of getting this back, can you view you iCal history at all?