Just take it one day at a time. I went through lumpectomy for same ILC last year at age 77, while living alone and driving about -30 minutes to the cancer center for 15 radiation treatments (piece of cake if one has no mobility issues), and dr./oncology appointments. All clear diagnostic mammo this past May. I find the hormone inhibitor Anastrozole the highest hurdle so far. Find great cancer support groups and such. I have received ongoing, fabulous support from the Cancer Center at the hospital, both on line and a few in person events. Hope you find the same.
You can do it!