[Maybe they were sweet nothings? Hinata wouldn't consider them to be that, mostly just helpless repetition of it's okay, you'll be fine, you've got to wake up, don't worry, you'll be okay, etc. He's trying to sound reassuring, but he's so, so afraid that the other boy won't wake up.

So when Faize finally opens his eyes, Hinata's breath catches in his throat, the hand not holding the gauze against his head wound dropping to his shoulder, just trying to let him know he's there.]

F-Faize! You're awake, s-stay with me, you've... you've got to stay awake, l-look, you've been worrying everyone, but it'll be fine now. You'll be fine!