For close to (5) years, I have had many of the symptoms you list (refer to profile) . I know how frustrated you feel. The best diagnosis my rheumy can give me is undifferentiated Connective Tissue Disease (UCTD). I too take placquinel, also methotrexate injections weekly and humira weekly. My joint pain has improved since starting humira although I am not pain free.
there seems to be many of us with similar stories.
Best of luck-GBS