I have PTSD, but i broke SI and ordered everything that i needed for SN method.
I think that what "helped me" was the fact that i lived a lot by myself, solving my own problems and my mind has some automation-biases, like 'this has to be done, just do it', like it is for washing machine, cooking, going to work etc..
However I noticed that, when i meet someone that knows too much about me, when I'm the focus of attention of someone or multiple people or whenever i can't control the situation, i start panicking and my SI takes control. I earned my freedom, my money, my SN and things, i don't want to loose them, i have to keep control at all costs.