What Causes Tremors In Head While On Aciphex?

I am 31, 5 foot 7 , about 180 pounds. I have been taking aciphex for couple of years now but have been on one of all the ppi stomach meds in the last 10 years. Recently I am noticing a tremor of my head. It will just slight start to shake from side to side and no one else can see it yet but I feel like they should be able to. Could this have to do with aciphex? Because I am also an anxious, stressed person.