Worry - worrying -worried

Taken from the dialogue of an old movie (1948):

Woman: I've spent four years hating you.
Man: Go to bed.
Woman: Don't you think that I am going to kill you?
Man: Quit talking trash!
Woman: All right, I don't think you'll be doing much sleeping. You'll be sitting up xxxxxxxx , afraid that you could fall asleep.

I cannot make out if the word that goes instead of "xxxxxxxxx" is worry, worried or worrying?
Which one fits best? Are all of them correct in this context? I tend to think that worrying fits best here (it implies continuity), but I am not sure because I don't hear the "ing" ending in the audio.