How to deal with a feeling that keeps coming up?

So I‘ve had this feeling for a long time and I used to cover it up by using drugs all the time basically. Now that I‘m sober and working on my chakras the feeling got even worse. I can feel where it is, it lies in my stomache. When I think of something that gives me anxiety like confrontation or losing something, it starts in my heart and then I got a constant slight anxiety feeling in my stomache. I heard you should sit with the feeling and integrate it, which I am doing right now ( sitting with it and trying to feel it or understand it ) but how do I integrate it? I thought that maybe I’ve unconsciously gotten addicted to that feeling because it does feel so familiar. I don‘t want to feel it anymore, I want to feel gratitude instead but that feeling is kind of distracting me from it.