Many people by the sound of things. Servers are probably overwhelmed after the push notification went out this morning that there was new content available.
It's a recurring problem with the Origin network. It doesn't seem to effect everyone when it happens, but the ones it does effect are logged out, and then have no option to log back in. Presumably, it will solve itself here shortly and you'll be able to get back on. But no guarantees, it is EA/Origin, after all.
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work don't worry!