Yes, discs can "unbulge" if you will. The body can heal itself in this way. There is still much about the back, brain and nerves that are unknown to us yet.
Something along the lines of ..Could it be, that because you had pain there from the disc it caused your pain, and even after it's no longer there, the brain and nerves think it still is and is still sending the signal to cause pain? This would hold true if you use the analogy of an amputee.
Some nerve pain that is there.. is just simply unknown. Doesnt help, just is a possible
reality for us nerve pain sufferers.
I do think and MRI might be more help to you as you see more on MRI then you do on CT Scan. Also if your nerve pain persists and they see nothing in discs or facets causing pain, then maybe an EMG to test the nerves themselves might be of help in trying to pin pont where your pain may be coming from.
I do hope they figure it out and give you relief. Take care. Tammy