Dude! I've been on the forum all this time and didn't know about this feature you just mentioned.Also go back to the post and check where you were typing sometimes it saves it. A little box will appear in the lower left hand corner saying restore auto-saved content.
click on that and continue away.
It even works if you shut down your PC I forgot to save a post and when I went back the next day it was not there so I went to type it over and all I did was move the cursor over the blank area and this little box appeared that said restore saved content I clicked it and bam it was there. I don't know if you have to set a setting but if you see saved in the right hand corner normally after I spell check it works.