I am seriously sick because all of sudden variations pages have stopped working. I have no clue on how can I fix it :( See below:
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There is a built-in tool
variationsfixuptool that allow to self fix issues within that variation relationship hidden list.
stsadm -o variationsfixuptool -url <absolute web URL> [-fix] [-scan] [-spawn] [-showrunningjobs] [-recurse] [-label <label to fix or spawn>]
In your case that's the -fix that will be helpful as it will allow you to correct
You also have the -scan switch to first get an overview of what could be broken.
Hope it helped.