Can I be made to do things against my will?

No. You cannot be made to do anything against your will.

There is an axiom among hypnotists, that "all hypnosis is self-hypnosis." The choice is always yours to enter or leave the hypnotic state.

Hollywood has done a lot to scare most people away from hypnosis. The truth is, it's more like meditation than magic.

If you want to enter hypnosis, you make the choice and do so. And if you want to leave hypnosis, you can do so at any time of your own volition. You remain quite aware of what is being said to you while 'under' and if you don't like what's going on, you can stop everything and leave the hypnotic state very easily.

That being said, if you encounter any discomfort during a session and you feel confident in your therapist, it is best to speak up. It may be that you have struck upon an important block to your healing and personal success and your hypnotherapist will be able to help you move through or transform it.