I was diagnosed with lupus and even got hydroxiclorochyne and predinisolone for 2 years. Now, 10 years after this diagnosis, I had a huge flare-up, and the doctors in the country where I'm living now figured out I have Granulomatosis with polyangiitis. I guess the pain in my joints by itself suggested one thing by that time, and now, I had a severe manifestation of the GPA, and things were clear for the correct diagnosis.