My husband had AVM in the lower spinal cord and had the embolism procedure done in Dec. 2015. He is still unable to walk without a walker and not able to do things he did before the procedure. The doctor who did the procedure looked at " an after MRI follow up at 4 months" and said it was successful and discharged him. He was told that the recover can take more than a year, but he is regressing. He is 77 yrs. old. Is this normal?