I guess this might be something to tell about to your doctor.

I also remember having this kind of beliefs as a child. I thought my mother and sister were poisoning my food and that my parents had hidden cameras in our house trying to film me.

I think it's better to tell now, when you know it's probably not true that you are being poisoned. It may become more difficult to tell if it becomes more serious.

I hope you will be having more good days and feel better.