decision surgerydegenerated disc depends on many factors i.e.
what kind of excercises and physiotherapy
you are doing at present and are you exhausted with it?
secondly, how much leg pain do you have weather it is equal ,more or less then the backpainand is there any neurodeficit? lastly your age, weight , general condition and preexisting risk factors like diabetes hypertension
pain relief after surgery and long term outcomes depend upon what kind of surgery is planned like just decompression or decompression with fusion or decompression with disc replacement etc?
general idea is if your exhuasted with all kind conservative approach then only think of surgery unless you have neurodeficit in your lower limbs
take one more opinion of good spine surgeon