Ok, I was just killed and went back trying to recover my body and my stuff and was killed again.
I’ve lost nearly everything it took me months to collect.
Is there a way to go back to a previously saved set of game data to recover my stuff?
Leave the game and re enter the game. Your corpse should be with you in town. If this does not happen, then you may have accidentally ‘popped‘ your body (but this only happens if you are running an old version of diablo 2).
The good thing about not playing online is that you can use an save game editor to give yourself your gear back.