Well, you know what I think...
With a half-life that long...I'm thinking it's still the culprit. And - you aren't getting worse being off it...and you certainly weren't getting better on it...so to me it seems like an easy decision...
Plaquenil is often prescribed for lyme disease...which is interesting if it is an immunosuppressant.
I have not been on it...not sure if my LLND prescribes it...as we have never discussed it.
Stay the course - i think that's a good idea.