... Balance problems?

Ah. So, this is odd. Apparently this has happened before, but I don't really remember it.

Does anyone know why someone might get ... staggery, all of a sudden? I woke up this morning (alright, no, I woke up four hours ago, I had a headache last night and crashed), and I couldn't get upright for a while, and now all day I've been ... lightheaded, and staggery, and every time I lean too far I can't catch myself. I've been walking holding onto walls since I got up. It's weird, and mildly alarming. Every time I lean too far, I just want to follow it all the way down, and lie on the floor for a while.

There's no fever, no pain, no illness as far as I can tell. I just can't stand properly. What the hell?

ETA: Okay. It seems to have faded off. Just a lingering uncertainty if I move too quickly.

Thanks all. I'll keep an eye on it, yes?