Artflow Won't Give Me My Picture Back!

I give up! I spent all night drawing a nicely topical cartoon. Thought it was going to be one of my best, so I even began to add some colour. I backed it up every so often just be sure. Then around 2am, Artflow crashed. Not a problem, I thought. Just load an earlier version...

Except every single version I now load deletes the 'ink' layer, despite my being able to see the ink layer in the gallery. It's now 3.40am and going to bed in a total funk. You can't see it on these pictures but this cartoon was looking so good... I love Artflow and my Samsung Note but this just makes me wary of spending so much time on a picture. I've lost work before but never so many hours worth.