Have Been Diagnosed With MGUS 14 Yrs Ago. Causes Terrible

Have been diagnosed with MGUS 14 yrs ago. Causes terrible pain. Within last 6-8 weeks it has spread to hands, along with severe swelling of both hands. Have been told I'm pre diabetic for last 3-4 years.
Should I be consulting my Rheumatologist or my neurologist, and what diseases should they be looking into. I've also been diagnosed with PMR, so yes, I'm thinking it's something to do with the autoimmune Any feeedback appreciated.
system.