I had an epidural steroid injection above my fusion site which is L4-L5. I had the injection on July 6th. My back has been awful since the injection BUT......I woke up today and my back was remarkably better. Is it possible that it might take an injection 8 days to work? Or perhaps it's just a "lucky" day. Can anybody weigh in on this. Do you think it could take that long or do you think it's just "happenstance?"