apple itunes will not accept my password. even after i changed it

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this happened previously. i changed my password last week - now it will not accept it. i went to change it and it said i cannot use the one i entered. i am tired of changing it every time to update apps. i am looking at a droid very soon. the phone no longer works with my car. it has become almost useless.
i will be posting this issue everywhere i can so anyone with Nissan cars know to avoid apple if they expect to take calls ever in the car.
i spent hours with an apple "genius" - nothing worked and apple will not allow to go back on the ios. so apple is pretty much done