Duck panting and over heating

[RunnersinMD]

I recently made a post regarding my oldest duckling (a week and a half) who seemed to be panting/ breathing with its mouth open/ overheating. I’m now here for an update and more advice on this duckling. After very closely watching this duckling all night (I get up once every hour to check on it) I have came to the conclusion that i don’t think it’s over heating, it’s nasal passage keeps getting clogged with food. The only problem with this is the duckling only drinks his/her water laying down so I have to manually encourage it to “lift its butt up” and stand up in order to dunk its head under to clear out its nasal passage. Their food has niacin in it (Purina flock raiser no medicated) so I really don’t think it’s a leg issue. It was perfectly fine before it started having this issue. Super energetic duckling. However now it seems like it only wants to lay around all day like it’s sick. It breaks my heart seeing it like this especially since just yesterday he was the “crazy energetic” duckling. Could he have some sort of respiratory issue? A bacterial infection of some sort? I’m open to any suggestions and advice as I truly do not want to lose this duckling (it’s my baby)!!

Did you ever find out the cause of this? Similar situation