I have some mild disc issues in the lower back (typical 50+ year old back). When it acts up, I can get some weird feelings - although I'm not sure I exactly follow your description of what your feeling.

More importantly, my back tends to act up any time I change my routine (sit more than usual, lay down more than usual, tense up the back for some reason, too much exercise, not enough exercise, etc.). I know you have been dealing with some tough issues recently - so I can only assume that your physical activities have changed from what you "normally" do. So, maybe its just your back "complaining" about the changes??