She gets off on watching the effects of uncertainty on her lovers, more than anything else. Draco can't remember what he was done to him, and now he can't be sure when he might die, either.

Harry would help Draco without a word of reproach, but he might very well walk away afterwards, or decide they should just be friends. That's what Draco is really afraid of. And since Harry has resisted Hermione's pushing on the potion, Draco doesn't really believe he'd listen to Draco, either.

Ouch. I'm sorry for reminding you of that.

And thank you!