polyclonal gamma region

I was diagnosed withh a polyclonal normal gamma region in my blood but, in the letter from my doctor it states that I am possible linked a diagnose of multiple mylenoma and or mgus . i also have arthritis pain in my elbows and joints and severe osteoprosis . What is the chance that lylenoma can develope from a polyclonal  B cell? arthritis is painful and i cough  even in class