Single player character has disappeared!

Hi all,

In a panic this morning, my brother logged into my Mass Effect 3 on my machine, and has somehow replaced my single player character with his own, and I don't know how to get my character back!

There's only one in the list of characters, so there's no option to switch. I went into the Documents\BioWare\Mass Effect 3\Save folder, and the only character there is my brother's!

Is there a copy of our characters stored in the cloud somewhere I can get access to? Help!

-Disco