While the placebo effect definitely does exist, I do wonder if a sense of agency (i.e. having the sense of control over your sickness) also has a similar positi

While the placebo effect definitely does exist, I do wonder if a sense of agency (i.e. having the sense of control over your sickness) also has a similar positive effect? The reason I ask is I've read many books about mental health over the last couple years. The more modern ones are all about acceptance and wearing them as a badge of honor. The timeless ones tend to talk about overcoming/controlling them by having a sense of agency. I'm not particularly proud or fond of wearing my problems as an identity. I think thoughts are more powerful than we believe. Sure we should absolutely talk about them openly, but how many people make themselves more sick because of their thoughts? I found myself in this pattern for awhile because I instilled the identity that I was sick. We all face the vicissitudes of the human condition. We all get to choose how we perceive them.