There is every possibility that you're entering a depressive phase - like the one mentioned a few posts ago. They usually start with a terrible few days of not understanding where you are or why you are. At least that's the way it is for me when they start. As mentioned in that earlier post, they can last a long time, but some don't actually last that long. It's a crap shoot and based only on the particular chemistry of YOUR brain, so none of us can really say specifically what is going on with you.
I suggest a call to your doc and tell him. If he understands depressive phases and you've had one before, then let him know you're in that spot that I call the whirlwind. When it happens to me, the best I can do is simply stand there and watch everything going on around me. Being bipolar, I've found my best action when that happens is to warn those that I live with and keep my mouth shut. I'm one who will say EXACTLY what I think about events. More often than not, that isn't so wonderful for those around me.

Keep it cool - and call your doc. Some mellow enhancing drugs are called for, in my humble opinion.