I feel like my mother is trying to poison me.
Are you sure about this? Do you think she'll actually poison you?
I don't know, I just fear she was poisoning me.
That's scary that you think your mom could do such a thing. But, she is your parent and there is no point in being that scared and paranoid. You should trust your mom or else you'll keep having a sad relationship with her.
I've been hurt and betrayed by her too many times. She is morally isolated in her head. She is a pathological liar.
It sounds like you have grounds for feeling she is trying to poison you. Granted, I doubt she is going to do that, but I do feel you should probably move out and find a place where you can feel safe. I think it's in your best interest to play it safe, and if you need my help with anything, just let me know.