Everytime you find yourself in a loss position the way you are describing now, buy some more if you have some additional funds to spare, just to lower your average price.
Doesn't work that great if it keeps dropping. Of course a lot of people doing that could also help stabilize it.
Guess its a case of supply and demand - a bit of extra supply is coming out of China whilst investors are working out what to do with exchanges - I'm sure demand will creep up again when the price gets to a tempting level. Questions are, what will the level be - and how much oversupply will there be from the China fallout. I'm still hedging on a rise later this year.