I give up

I actually thought I had some clue of how to deal with the stock market... but the last couple of weeks have shown me I was nothing more than delusional. Tell me, how on earth do you trade this market?

Take today, for example. Morgan Stanley was depressing all morning; by the time I went to lunch, the stock was trading at $10 and change. I mean, it was awful.

I come back around market close and look it up. The sucker went up all the way to $15 and a half or so. In an hour! And that's just an example. Another of my holding, Google, was 20 points down before lunch, closed 40 up. What the heck? seriously, this is nuts.