Runner duck can’t walk

[Vanillaandbean]

Hi everyone, I’m really worried about my runner duck. Since yesterday he hasn’t been acting like himself, and this morning I noticed he can’t walk properly. His wings droop to the side, he struggles to stand, and when he tries to move it’s more of a crawl. His head has a slight wobble too. he’s still eating and drinking just fine. He’s 10 months old, and I’m so afraid this could be something serious. I love him dearly and really don’t want to lose him, so any advice or guidance would mean a lot.