I'm new to this forum and don't have much experience with CPTSD, just was diagnosed recently.

But I have recently gone through an Intensive outpatient program based around DBT and what you're doing - facing the thing that causes you stress until it doesn't bother you kinda sounds like a skill that DBT teaches. It's about fear/anxiety. Basically if something isn't trying to harm you but causing you fear/anxiety the idea of DBT is that you act opposite of the fear/anxiety and face it.

I've been told that DBT can be effective for PTSD. AND (this is a big AND) there are books that you can read and skills that you can learn on your own without having to go to a therapist. There are excerises and worksheets that help you track moods and triggers and things like that.

The two books that have been used in my therapy are The Dialetical Behavior Therapy Skills Workbook by Matthew McKay and The Dialectical Bheavior Therapy Skils Workbook for Anxiety By Alexasnder Chapman.

Because I had been through this I also bought the DBT Skills Training Handouts and Worksheets by Marsha M. Linehan. This is supposed to be a companion to a book for therapists. But there is good information and again, it has worksheets and ways to track how you are feeling and your responses.

I don't know if these will help but you could try looking at the in the bookstore and see if it's something you'd find helpful. But it's a way to get access to therapy without seeing a therapist.