This sounds almost identical to my diagnosis back in 2019. I was also 64 at the time. My Oncologist immediately started chemotherapy (7 rounds), and 32 radiation treatments with surgery a few months later. What a life changing experience. I got through all of this and have a few battle scars. You will get through this too. Stay strong. There will be good days, and bad days. I can’t emphasize enough the importance of exercising. You won’t feel like it and will need to push yourself. I have a wonderful wife who kicked me in the butt, and made me get off the couch and walk. My Son didn’t cut me any slack either. That’s one of the main reasons I am here today. Life isn’t perfect as I still deal with complications from the surgery every day, and will for the rest of my life, but I am still looking down at the sod.
Good Luck!! You will win this EC battle too.