Some years ago, I had a long illness (lung infection) that left me nearly a couch potato. Pain from osteoarthritis and a hyper reactive inflammatory response to everything also left me in a lot of pain. I sought help at a pain rehabilitation clinic, where Physical Therapy and mindfulness training were both part of the program. PT can also work with you on your gait - making you conscious of ways to walk with less limping, even when you hurt.
Here is how I started back walking
- new, cushioned shoes with orthotics (the PT put the orthotics under the padding and it helped)
- a warm shower and stretching
- massage Voltaren (a topical NSAID) into m feet and other painful joints
- do my breathing treatment
- take a short walk (at first I think the total length was maybe 200 yards) while concentrating on walking as straight as possible and breathing deeply. Pausing halfway to enjoy nature around me, then returning home to a waiting lawn chair to spend 5 minutes reflecting quietly and breathing deeply.
- later in the day, a second short walk
- Every few days I would add to my walk - past one more property in my neighborhood, which would add about 50-60 yards to my walk.

What was important
- focus on movement, what is around me and my breathing. Push the pain to the background.
- walk on dirt, wood chip or gravel path if you can - easier on the feet.
- just do it.

On good days now, I can walk 5 miles or more in a day (not all at once) but even on bad days I aim for at least a mile.
You might be interested in the book "The Way Out" by Allen Gordon and Alon Ziv. It teaches us a different way to view pain, understanding the difference between pain that signals danger and chronic pain.

Have you had any PT to get you back to walking? Based on your body, a good therapist can make really helpful suggestions.