Positive RA factor but negative for all other blood tests

Hi. I am new to this forum. I was diagnosed with Lyme disease in April 2019. Because of discomfort in my hands the RA factor was done which was 117. In October the RA factor was 137. The rheumatologist ordered blood tests for other RA indicators and Sjorgrens syndrome and all were negative. I have fatigue, morning hand and elbow discomfort and very dry eyes (optometrist says I have blerpitus (not correct spelling). My eyes feel very heavy. Not sure how to handle my symptoms. And is it possible the RA factor positive from the Lyme? Any assistance or advise would be greatly appreciated. Thank you.