HI Lisa - It's great to hear that you are working to take control of your own health. Too much sugar makes my joints hurt worse, so when I get a case of "the nibbles" I often reach for a few strawberries, raspberries or grapes. For me, frozen fruit, half thawed, is very satisfying.
Maybe if walking is too painful, you can either pool walk, letting the water support you. Or, sometimes riding a bike - regular or stationery would be easier on your knees? That is what my sister-in-law did while waiting for her TKR's
Just keep taking your baby steps.
What do you find satisfying to snack on?
Sue