I have my own health-related anxiety... not much, but a little bit.
I also have OCD, and worrying about getting sick/dying tends to be a part of it, in my case.
It's totally understandable, considering what you've been through, being constantly on guard and worrying about your physical health... It also gives you a sense of psychological control over yourself and your body, being constantly aware and watchful.
The need for a sense of control and keeping yourself safe and whole is a fairly common thing among survivours of physical abuse.
I'm glad to hear that therapy is helping.
I've also started a new kind of therapy to work on my trauma and understand how meaningful it could be.