Akisej, someone reported having a similar issue except they hadn't stopped playing for awhile, it just...happened. My first question is, are you connecting to Origin? The person who reported the issue said that, every single item they DID NOT pay for disappeared, while items HE HAD paid for, did not.
I have Origin installed on here, but I don't start the game with the launcher. Even items I paid for and legit free downloads have disappeared and my save files also disappeared. After posting about it, I decided not to play, and now I'm finally getting around to playing almost another month later. I'm going to have to assume I'm missing some vital memory of doing something to make this happen. It wouldn't be the first time my memory has failed me. But now I have this on record, so if it happens again... ;P
Thanks for the additional responses! Pescado is probably right though... tight pants.
Edit: I am a freaking moron. My 'My Documents\Electronic Arts' folder was in a 'My Documents\Downloads' folder this whole time. I just noticed it. My pants feel incredibly tight right now. XD Thanks for the suggestions all the same and sorry for wasting peoples' time.