Synchronizing multiple profiles

I’ve been experiencing one problem after the other with Anki lately. First, Anki wouldn’t open anymore. I read here on the forum that I should uninstall Anki, restart the computer and then install the 32 bit latest version. This worked as far as opening Anki is concerned. But after I managed to open it, I chose to sync by downloading form Ankiweb and one of my profiles, the larger one, was replaced by the other one and now I have two profiles with identical content. That is to say, my main profile has been deleted. The strangest thing is that this main profile has disappeared even from Ankiweb. The fact that I might have lost my entire collection is daunting. Is there anything I can do to recover it? Thank you.

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