Flowey it's gonna take a little bit before you're back to full health so why not pass the time by asking Sans if he has any questions for you?

Good job Flowey, and sorry we made you do it. I know that was hard to do.I'm so proud of you, Flowey. 

Woah you're suddenly being really nice, Flowey. What's the deal with that?It'll be okay, Flowey. Just keep being brave and do your best. I know you can do it.