Hi bk,
Wish my MRI looked as good as yours

seriously though there are other areas that can cause your symptoms, some of the joints or areas the sciatic nerve passes through can become inflamed and cause pain and weakness, should resolve with time and patience. PT and a good exercise regimen really help also see if you've been positioning your body in weird ways when you're at work or sleep. If there is an area of inflammation a steroid injection in that region might also help if things don't get better on their own.
Hope things resolve soon,
W