It's times like these that you ought to be writing down your thoughts in your diary, blog, notebook,... for future reference. For eg. I could be writing down, "I wish I had....,
1) More cash - so that I can start picking up some 'discounted stocks'
2) Sold my 'Stalwarts' more aggressively before they xd - so that I don't feel heart pain to see it dropping much more than the Div
3) Had not aggressively chased after so many 'Growth' stocks - so that I don't have to see the Share Price Growing so fast in the -ve direction
4) Had not bought so fast - so that I won't be seeing cheap getting cheaper every day
The above is just an example...
I think if you'd been doing your Buy/Sell based on your own set of valuations, you'd not be as badly affected. Can also just sit tight and ride this out as you're confident of your stocks.
It's also times like these that you start to appreciate your Dividend Yield Stocks as most had not dropped as much (in % terms) yet as others. That's not to say they won't free-fall soon. What I'd do, would be to be selling many of my 'Stalwarts' (those I have not sold before xd) to switch to others which'd dropped a lot more (in % terms). BUT, I won't be too aggressive in the buying (selling, yes) ie. Q at a few bids lower and in smaller Qty. I'd be doing what TA experts call 'Catching Falling Knives'. Wish me luck!
Having said the above, I'm glad that this time round, I have a lot more cash to play with (usually almost zero and will be selling my Stalwarts - Switch here, Switch there, Day in, Day out,...). It's also a good time to come out and play if you'd done your homework and had been eyeing some stocks which'd seemed so expensive just a week or so ago...