OOoo, the internal vibrations. Those are the worst-but I have modified them. I call them my little "earthquakes" inside the body. I used to be scared of them and now I just roll with them. It sounds crazy but somehow I got my body used to them. When they come on, I just lay or sit real still and meditate silently and think about a volcano in Iceland or an earthquake in Hawaii. Reason being is, I think about these in order to put myself in a "moment situation" and imagine I feel those vibrations from an actual "event". That is a mind game I play on myself to make it seem "more normal". I laugh sometimes and imagine I have a "super-power" that I dont know what to do with. I also have cut out Coffee, Soft Drinks with caffeine, and a lot of sugar content-(it aggravates the tremors-makes them worse),
I dont know if that "mental game" would help you but it has me.