If we are co creators and everyone else is us pushed out, does that mean we create others realities

What if it's negative?
If someone wad always worrying about someone else getting ill, will that person get ill?

If someone keeps telling I should go to the doctors otherwise things could go wrong, does this mean they will.

Will other people's beliefs create a situation in my reality where I'm ill!

I'm not worried but if someone else is worried about me getting ill, will I become ill because they believe I will?

Also if someone goes blind, can they get their sight back? If so, how?

Please help