Chemo Fog is real, and does cause confusion and forgetfulness...but most likely is not at fault for the other problems. Diet, rest (regular bedtimes etc), mental engagement, exercise...all will play a part in the cure.
I was reading your original post-its only been a year for you since surgery? People recover at different speeds. I got so depressed when I would read of people going skiing and the such within months of their surgery. I didn't before, and will never do anything that energetic but hearing how much more quickly they bounced back was depressing. It takes time...to come to terms with the disease/mortality, you made a major life change in your move, time for your body to recover and you are still in treatment! Please get out of the house each day for something! Even if you can't join an exercise group of some kind, do something you either like or are curious about, even if it is going to the Library instead of being on the computer in your house. You like yoga...try a beginner class. The thing about yoga is it is at your pace, your capabilities...so do what you can. If I lived close to my treatment facility (an hour away for me) I would go to one of the support groups as someone suggested to you. Please give yourself time to adjust and heal. All the best!