I truly do not think you are going to die Kiari.
I can understand your being afraid of the dream, it is all very new to you this feeling of kin, and dreams can be incredibly unnerving things.
You are alone and vulnerable, and in a completely strange environment.
But if you can, try to think calmly over what you have told us of your dream.
You have said that you believe you were drugged, but is it possible that you were meditating and so just really relaxed, and not listening to the outside voices of the people, only the voice coming from within yourself?
It could be a message to you to ignore the ideas and thoughts of others who would make you feel bad about yourself and only to listen to your inner voice. To the voice of the person who is always on your side.
You.

The girl looks like you, and she says she is you, she is willing to be called by you, and that you two are one. She sounds to me to be attempting to make you understand that she means you no harm, and that you should not be afraid.
Then you say she turned into a flash of light and a black thing with red eyes tried to attack you.
Is it possible that the flash was the girl reverting to her true form, and the red eyed black creature was simply her trying to return to you?
I cannot really comment on the sign as you haven't given much information, but it could just as easily have been a protective or guiding symbol as anything else.
These are just my thoughts on this dream as you have described it Kiari.
I hope any of what I have said here helps you.

Wraith.