ABOUT 7 YEARS AGO I WAS DIAGNOSED WITH OSTEOARTRITIS IN

ABOUT 7 YEARS AGO I WAS DIAGNOSED WITH OSTEOARTRITIS IN MY LEFT SHOULDER. 6 MONTHS AGO, THE PAIN BECAME SEVEAR AND I RECIEVED MY FIRST CORTISONE INJECTION (IN THE BACK OF MY SHOULDER). TWO WEEKS AFTER, THE GP DECIDED TO GIVE ME ANOTHER CORTISONE (IN THE FRONT OF MY SHOULDER.) THIS WORKED FOR THE 6 MONTHS. THE PAIN RETURNED AND I RECIEVED MY 3RD INJECTION. AGAIN A FEW WEEKS AFTER THE PAIN HAD NOT EASED, SO, 3 WEEKS AGO I WAS GIVEN MY 4TH INJECTION. I AM NOW BOOKED IN FOR AN MRI SCAN. I HAVE AN APPOINTMENT WITH A CONSULTANT AND THE GP IS REFERING ME FOR SURGERY. MY CONCERN IS THAT SINCE MY LAST INJECTION. THE MUSCLE IN THE TOP OF MY ARM FEELS DEAD. IT IS ACHING AND IS DUPLICATING THE PAIN IN MY SHOULDER. I HAVE SPOKEN TO MY GP ABOUT THIS AND HE HAS SIGNED ME OFF WORK AND TOLD ME TO REST IT.
NIGHT TIME IS BAD AS THE PAIN IS WAKING ME UP. I AM TAKING CO CODAMOL 30/500 AND NAPROXIN 500MG. I HAVE TRIED A SHOLDER SLING.
COUOLD THE PAIN BE THE CORTISAON AND IF SO, IS THERE ANYTHING I CAN DO. I HAVE TRIED LIGHT EXCERCISES AND THIS IS GIVING ME A DEAD ARM AND PINS AND NEEDLES.