Ladies and gentleman.
Always, always, always back up your files in at least two, preferably three or more, locations.
Especially when you’ve put 20,000 words into a new story in the past 3 days. And your flash drive, on which is stored about 10 years of your life, does this weird sort of bendy thing and then blinks at you strangely.
It is probably unnecessary to say that my muse fled and has not returned.