Can hypnosis make me do something against my will?

No, you never do anything against your will.  It’s necessary to understand how powerful your mind really is - if there is a suggestion offered that is against any morals or values the mind rejects it. 

The brain wave that is utilized during the beginning phase of hypnosis is the same brain wave in which two thirds of television viewing is spent. Advertisers know this and they use it to encourage us to purchase; our purchases however are still within the realm of our control.