Help me!

I have been working on shape keys for an animated talking head and in the process I must have hit a combination of keys or accidentally clicked on something and now when I try to move verts or faces around and change the shape of the mouth it is acting like it is possessed. I will click on an arrow to move it along an axis and it will move the opposite direction than the mouse. I tried to use rotate to see if it was acting up and it almost acts like I’m using the scale function. What did I do? I don’t want to start over.:frowning: Please Help me.

it’s better to post a .blend, maybe?!