Aloha! You're speaking with Dr. Michael Salkin
I'm sorry that your question wasn't answered in a timely manner. I would have declawed Tickles long ago which would have obviated the need to treat medically for such a very long time. Whether there was a bacterial infection or autoimmune disorder, declawing should be curative. Please let me know if this has been discussed with you and why it hasn't been performed.
When things seemed to be going backwards rather than forward I raised this point myself. I was reluctant to suggest it as I believed it would be a very painful experience for the cat in the short term and might also be viewed as cruel. I was told that it isn't something they generally do, but know of people elsewhere in the world who ask this to be done in order to protect their furniture. It doesn't appear to be an option at the moment.