I'm so sorry to hear that your sister is sick at the moment Wiz!
I really hope she starts feeling better real soon and that the doctors can figure out what is going on and treat her properly.
As the others have said, your sister was lucky to have you with her that day and i'm sure she is so grateful for you taking such good care of her!!
You are both in my thoughts and prayers and I hope that the stress test goes OK. Please keep us updated when you can and if you ever need anyone to talk to, I am here for you!!
Alison.