My one-year old drake is going through his first molt and all of the feather loss that is happening appears to be normal, healthy, no issues there..... However, he doesn't seem to be regrowing the feathers he is shedding and I'm starting to become really concerned. He's literally shrinking before my eyes, lol... His beautiful emerald green head has now become a whitish-grey again, and I'm starting to sense that he's also becoming stressed as the days go on over his feather loss. What could be the problem? 
First photo is pre-molt, second photo is the most recent.

First photo is pre-molt, second photo is the most recent.