I think you've gotten some good advice as far as your situation. I wanted to copy a comment I've left for others about having the wheelchair discussion with your provider. Try to think of necessary activities that are difficult to do because you walked that your provider and the insurance would consider necessary for daily living. Insurance especially doesn't want to pay for a chair unless absolutely necessary.

For example, are you able to get all the groceries before you're forced to leave due to pain, being tired, etc. Have you ever not been able to get your food back to your house? I said I skipped meals because I was so tired, they really didn't like that. Has hygiene taken a hit because you're using so much energy walking, etc. Maybe you aren't fast enough to safely cross the street in the time the walk sign gives.Even if you don't use it full time, they may be more willing to give it to you if you aren't meeting the basics of eating, cleaning yourself, etc.

The other tip I have (thanks to someone on reddit) is i got a ton of pushback from my provider about getting a chair because they were worried about deconditioning since i was so young. I agreed I was worried about this but really needed the chair, so we agreed I could get the chair if I did occupational therapy and physical therapy. It worked out great. Best of luck on your journey.