Yep, don't make a big issue out of leaving and coming home.
Tell him you will be back soon then just leave (even if he is blocking the door, just walk through him). When you come home, ignore him until he is calmer then say hello. Be consistent and you will eventually be able to leave when he hears the words 'I'll be back soon' because he will associate that with you going and the fact that you do come back.
if your GSD is eating and eating and eating and losing weight - please consider testing for EPI.
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