I had ant. cerv. discectomy in 2012. pain and grinding sound in neck , fingers turn blue, numbness in hands and leg, pain in back going to left leg. ?

So sorry: I feel so bad that this has happened to you. The best approach would be to find a neurosurgeon and get your self reevaluated with a good examination and MRI. Then hopefully you can have the correct surgery. i so wish you good luck

Something else: symptoms in legs have nothing to do with your neck. the grinding is consistant most likely with bony scar tissue from the surgery, which is not a reason for repeat surgery. You need nerve studies to see if you have an underlying nerve disease (neuropathy). I would see a neurologist