it's hard to explain what I mean
I know what you mean. It's like prescribing someone water pills for their headache and after they take them they feel like their headache is better even though the pill did literally nothing except convince that person that the headache would be soothed.
Hypnotism is not quite the same. While it is true that in order for hypnotization to work you must be relaxed and willingly to be hypnotized, it has been proven to help people quit smoking and stop gambling, or to lose weight. I have never been hypnotized, and as a person who doesn't really want to be, I don't think it would work. Some people have first hand experience in being hypnotized and say it really did work for them. Who knows, maybe it does work for some people, but I am guessing it's not the majority.
Back when I was in school they had a hypnotist come on stage in the auditorium and hypnotize some of the students. Some of them were not hypnotized and left the stage early, but the other half of them seemed actually hypnotized. The guy had them doing things like smelling a horrible smell, and laughing uncontrollably, making animal sounds, and making everyone in the audience seem "naked" to them. I talked to some of them after and they all claimed not to remember anything during the session