Hi,i Am In My 80s And I Am Dealing With

hi,i am in my 80s and i am dealing with copd and cancer.i do not take any meds for cancer but pro air and a nebulizr for the copd...i know i have a terrible problem but would still like to know if there anything i can do to help bring down the heart (100-114). so i will not be so exhausted...i get very frustrated as i cannot do anything without exhausting efford ....i know this is asking an awful lot but i know if i could do more than basically i would be much happier than just sitting....thank you....