Macbook Pro literally going crazy

My mac had been working perfectly fine until this past friday.... I went out and came home and it just went crazy.

First thing that is going on:
It's like someone has a mouse and has taken over my computer, if it's not the menu buttons going crazy then it's like someone is constantly tabbing to all the folders on my desktop and when i type it's like someone is holding down the arrow to go back to the beginning.

Second thing that is going on:
I will shut the lid down, but it won't go to sleep, the apple keeps glowing and fading, glowing and fading... the fans keep running and if i leave it for any amount of time like that, it gets extremely hot.

Third thing.... my arrow keeps flickering in and out....

It's just so bizarre... this was a great machine until friday and now it's aggravating the crap out of me.

I've run tests and everything says it's all ok, but it just doesn't make sense.

It's like it has a mind of it's own.

any help would be great.