Ouch, that's painful. It reminds me of my days when I was learning computers and would work all morning at my job and then turn it off for lunch. Of course everything disappeared because I didn't save it. But 43 hours would be the equivalent of a whole week at most people's jobs! Or, maybe that would only come to maybe 4 hours work time, and the other 39 hours spent looking at "art" websites, emailing people, and sipping coffee while looking out the window. You know, work. Maybe that's why I find retirement exactly like work?
I guess the messages for you if you can't recover it are to always use a tiff file, save as you go along so that you have multiple versions going, or just pitch the whole thing and get a film camera. My recommendation is for the latter, but there is no guarantee you won't shot a whole day before realizing there is no film in the camera either, or that a light leak won't ruin all the best shots . It's important to remember that all things are impermanent too, and some things are more quickly impermanent than others.
