Agree STRONGLY, NO cortisone, it kills mitochondria thus cells die… terrible stuff. I agree with Merlin’s mix.
I wonder if you also have inflammation of the nerve. Rubbing over the lower back and the nerve plexus and painful areas sounds right. Getting onto this immediately sound right, do not delay as if inflammation builds up it gets worse in my experience.
Watch out for muscle spasms because of the stimulated upset nerves. Be very careful about twists or lifting, no high heels. NO getting down on the floor( getting up is very hard) or any action which will cause stress. Would be good if you had some relief from the long time standing, lying down for bit now and then and stretching out would be good. good luck. Thinking kind and loving thoughts at the torn discs etc can be helpful in releasing any emotional trauma located there.