It could be Bart or Lyme. Lyme can cause swelling in the joints. My fingers / knuckles were swollen too when everything exploded. My feet had discolored nodules. My ankle was swollen too. The foot pain and swelling did calm down. It was pretty painful. I thought I might have gout too. I really hoped I did not. Then I found out I had Lyme and Co.
It sounds like your on the right track.
Here's a recent thread on Bart treatment:
https://www.healingwell.com/community/default.aspx?f=30&m=3451606