Lung cancer due to asbestos

I have been diagnosed with ling cancer caused by asbestos, I was not aware that I had been anywhere it

due to a heart condition Idid not know I had it showed up on ct scan of lungs the constant says treatment would cause me more problems and distress

in the time I have left (6 to 12 months) I am 83 years old have been very fit until now walking my dog for 2hrs a day and on no medication

I do not know weather to push for treatment