I didn't see anybody describe intimacy anorexia to you. It's adjacent to sexual addiction, basically withholding sexual and emotional intimacy from yourself and your partner, in much the same way an eating disordered individual might withhold healthy nourishment from herself.
My wife had this, I believe -- I can't diagnose her, obviously, but in retrospect, the behaviors described at https://intimacyanorexia.com/intimacy-anorexia-characteristics/ match her almost to a T.
I've tried to describe it elsewhere, and it can present in different ways, but in her case, it was almost like she was able to be wild and sexually uninhibited with me while there wasn't a safe emotional connection, but as our emotional connection deepened, her fear of intimacy overtook her and caused her to withdraw further and further both sexually and in emotional vulnerability: she kept herself extremely busy, she wasn't interested in deep conversations about the marriage, or about ourselves, etc.
If that sounds like you, there's a kindle book at
but I wholeheartedly endorse the other posters who have recommended approaching this in therapy rather than through self-help books. At most, I'd say, let self-help books help guide the conversation with your therapist, and help you to highlight the areas that you really want to work on.
I'm really proud of you for recognizing this and tackling it head-on!!