Leg tremors when resting

My husband had a bulding disk at L2-3 for about 4 years and also some leg tremors. The tremors only happened when he laid down to sleep and were like severe shaking for about 30 seconds, subside, then begin again. The neuro thought is was epilepsy so has treated him with 4 mg. of Lorazepam and controlled it a little so he could sleep. In August the disk ruptured, went through months of PT with no help so had a laminectomy on March 11th. Now the tremors are out of control and his Lorazepam along with the muscle relaxers (methocarbomal 750) and percocet 7.5 are not controlling it which is not letting his back relax at night so is completely exhausted in the morning along with pain. Can you give me an idea of what it might be? My husband sees the surgeon on the 10th for postop. fpur years ago he also had an MRA for MS, checked for Parkinsons and nothing.