What Causes Swelling And Tingling In Left Hand Fingers While Having Rheumatoid Arthritis?

Yes, The last three fingers on my left hand, over the last year or so have become swollen tingle and at night while asleep they get numb and wakes me up. I went to my Rheumatologist who indicate it wasn t related to my Artihirits. At times the hand will fold in half, the last three fingers and palm folding in on the hand and sort of cramps up. Both hands have contorted fingers from years of Rheumatoid Arthritis. Have had a recent test for Carpel Tunnel that indicated slight restriction but not needing immediate action. My next step ?