Hi doma,
I don't really know much about why the placebo effect works to the extent it does in healing.
But it sets the bar for medical testing. The pharmaceuticals companies have to exceed the placebo effect in order to have their products sold as medicine. So I don't see them being affected by your belief model.
But I shall have to read some material about what is known about placebo effects and why they work. I know, for instance, that prayer has been scientifically tested on occasion to see if it works, and it apparently has no effect on results. So I think the success of belief in having a medical effect must be a personal thing.
This is why I enjoy these conversations with you. Gotta keep thinking.