my 78 y/o husband has a slight head tremor- it moves from side to side. These are the drugs he is on eliquis, norvask, protonex crestor, albuteral, advair inhaler, flonase laxis, potassium. I noticed it within the last 2 weeks. He was a slight case of shingles from may thru July 1st. Care to give an educated guess on what s happening? Thanks- Patty