What Causes Weakness In Right Arm While Suffering From Spinal Stenosis?

as an RN SINCE 1982, TO PRESENT, I HAVE WORKED IN LARGE TEACHING HOSPITALS THAT ARE LEVEL 1 TRAUMA CENTERS. OVER THE PAST 8 YEARS IT HAS BEEN MORE DIFFICULT TO PERFORM MY JOB LIKIE I WAS IN MY 20S AND 30S I WORKED ALL THAT TIME IN CRITICAL CARE AND THROUGH THE YEARS I HAVE FOUND IT INCREASING DIFFICULT LIFTING, TURNING, TRANSPORTING, REPOSITIONING ETC. MY RIGHT ARM IS WEAK. I HAVE SPINAL STENOSIS IN MY BACK AND PAIN ALSO IN MY LEFT HIP AND KNEE I AM 5'5" AND WEIGH 130 LBS PHYSICALLY I AM 'SHOT" AFTER WORKING FOR DAYS AND I DONT WANT TO GET HURT EVEN MORE