What's your burn rate? That is, if you stop doing any income-producing activities, how long can you live off of savings? Considering burning through them all for a long period of no work. Or if you think you can manage for longer, try to get to the magic number where 4% of your investments (assuming at least 5% annual ROI) covers your expenses, thus making you 'retired'.

Recovery (at least partial) is still possible, but you might be at the point where the first year of recovery looks like a lot of doing nothing but sleeping: http://jacquesmattheij.com/dealing-with-burn-out