At what point did InDesign crash? You say InDesign was running slow, and that you had to restart. (Though I question whether rebooting OS X is necessary to fix sluggishness in one application.)
Did it crash when you tried to quit it?
And ID opened a recovered document when you launched it? But what about the actual document that you had been saving? There may be a dinstiction between the two. Perhaps that is still intact?
And surely you have a Time Machine backup that would include a newer version of the file?