Might be time to see your doc and get a new set of MRI's. This would give you and your dr much for current information on the state of your back. Good luck, and as you are a fitness instructor and I'm assuming, in good shape, you should heal quickly if any intervention is needed.
Hi,sorry to know it,How about your conservative treatment? is it woked little bit?
Some patients who experience severe pain and a high loss of function and don't find relief from conservative treatments(exercise ,traction,physio,acupuncture,etc), surgery may be considered as an option.
Of course,Don't rush to surgery.only 2% patient should be.
So,you shuold go to see your own doctor for advice.
Take care!