Refusal of treatment

I'm sorry if I upset anyone its not my intention.I have suffered with severe mental health like forever,my daughter watched her nan go through terminal cancer and now she lives with her dad as he goes through bowel cancer,now I found a hard pea size lump in my boob and I don't want treatment I don't think my daughter could cope anymore,does anyone know if the mental health team could force me to have treatment.thankyou