I have anxious attachment style and Im currently trying to detach from my ex

My ex broke up with me almost 2 months ago due to how exausting the relationship become for her. As a person who used to enjoy time alone, now being alone is the worst thing ever. Im trying to detach by not texting my ex or when I do its because she sends a text and I just reply but I force myself to take hours and for me to reply, not checking her socials and just focusing on my own life. When alone I cannot take my mind of problem my brain is always asking what if this or what if that, whenever I see her name pop anywhere I immediatly get a horrible sharp pain in the chest and it sends me spiraling. My idea of feeling " normal " these past weeks is been feeling weak, tired, shaking sometimes, and feeling my chest tight. Im really trying my best to detach as I want to be able to be completely fine whether we come back in the future or not because she was truly an amazing woman that always made me feel the best version of myself and I grew up with her and we match like the perfect duo. I know I have to heal myself now and give her the space she needs, I know I cant rush something like this but its been so hard. Im changing my bad habits and healing myself in all the ways that I can not only for me but the ones around me and that includes her to because if there is a chance in the future, I wanna be the man that she deserves and that can give her a beautiful life that she deserves. With that said I wanted to know good ways of dealing with this anxious behavior, whenever I get worse I try to to take deep breaths and tell my brain that what Im thinking are not facts but they are stories that my brain is making up in order to protect me but it still hurts and doesnt make the pain go away.