Answer:
ok it's been a minute since i have read Romeo and Juliet (like a year) so please judge my answer on your own knowledge.
from what i remember this monologue that juliet gives is right before she drinks the poison/mixture. In this monologue she second guesses herself and is showing her anxieties about what she's about to do. (finally i might add) this also shows her thinking through it a little bit.
The nurse makes the whole situation for Juliet more stressfull. I think it makes juliet more panicked as well.
Sorry it took awhile, had to look it up. i really hope this helps and i am sorry if i am too late. also if it is wrong i am sorry as well. Have a good day and be tiger fierce! :)