I did not give due regard to my sciatic pain and continued to train until one morning when I awoke to a full disc herniation (L5 -S1). I have bee nine months recovering and I still can only roll very gingerly one or two times in a row. The best advice I can give you, and which I sincerely hope you take, is to rest. Don't do anything that even remotely irritates your back problem. I thought I would simply tough out my back pain but this, in retrospect, was very foolish.
I am relatively young, so sitting idle is very difficult and at times has been impossible. My unwillingness to refrain from dabbling in training has lengthened my recovery time, of course. I am only now realizing just how completely inactive (in terms of aikido training) I need to be in order for my back to improve.
I have a half hour stretching regimen and some torso strengthening exercises that I do twice each day and they have helped immensely.
Hope this is helpful. Take care.