How can I stop being so pessimistic about my life??

I have a life-threatening disease (HPV) and it's greatly took a toll on my life. I'm very depressed and feel like life has no meaning anymore because I'm slowly dying of developing cervical cancer. I used to be a very outgoing girl, always had a smile on my face, always cared greatly about my looks, but now I'm lucky if I even want to get out of bed in the morning. I barely get any sleep cause I have so much anxiety. I'm just so scared to get cancer, I just wanted to live my life normally now I can't cause I have to live the rest of my life worrying about getting cancer. Now I probably won't be able to have kids cause I might need a hysterectomy early or I'm gonna get so many treatments that my cervix will be halfway gone. How can I stop letting HPV run my life?