Oh Diane, I can relate to some of what you're writing. I hate for you to go back to that doctor you talked about
but you should be screened for depression. Depression has many manifestations and sometimes it's temporary or just underlying long term. If you had a professional you could trust, it might help to talk about
this and possibly have medication prescribed. Sometimes being low in B-12 or vitamin D can cause problems, so make sure you're getting enough through food or supplements.
I'm glad you have a good place to live though. You're independent but one of your sons is downstairs!
Try making an interesting menu, a simple one, and go grocery shopping. Buy frozen veggies if you want, like spinach, riced cauliflower, green beans. Fresh vegetables, too, of course. A simple meal like a piece of sauteed chicken piece and two veggie sides. For the past few years, I've been putting a varied 'salad' plate on the table that changes nearly everyday: one or two fresh mushrooms, a piece of cheese, two pieces of raw broccoli or cauliflower, cilantro or fresh spinach leaves, a couple of those tiny tomatoes, a cuke cut up, etc. Write up a menu for the week so you have your mind busy planning and looking forward to something, and you'll have a grocery list.
And to heck with not going out because you think you're too overweight to walk for exercise. Walking is one of the best things you can do for yourself: breathing, thinking, clearing your mind, circulation, heart health, blood sugar, blood pressure, mood...
I made lasagne with broad slices of zucchini instead of pasta. Instead of ricotta, I used provolone and mozzarella.
Another favorite is spinach quiche without crust. Or, ratatouille. Both are great with roasted chicken.