As someone who has survived cancer and as someone who is caregiver for an uncle, I want you to hang in there. Your wife may be doing okay outside but her insides are very confused and scared. Do what you can for her, dont let the comunication between you end. Talk to her, tell her how you feel and give her time and space to come to you with those feelings also. Do something for yourself also. make sure you get outside often and go out with other friends sometimes. I remember during my Chemo treatments I was unable to get up the stairs to bed so had to sleep on the couch, my wonderful other half would sleep in the chair next to me rather than leave me downstairs alone. My prayers are with you and your wife. Good luck.
Susan