Ain't s'posed to be lots of pain from the Trial.... sure, a bit from the "getting it in" part, but once the Trial sets in as the means to reveal whether it works for you..... I was hopeful you would not be burdened with pain from getting underway.
Mine is Boston Sci Precision Plus and I have had the benefit of the buzz since 2010 now. I am thrilled to be one of the successful recipients.
That sensation is difficult to describe when you first feel it, and the nerve stim effect is kinda hard to grasp. Even so, with time, and I encourage you to keep a diary throughout your "week" Trial, maybe it will all settle down enough to give you a good and vivid picture what the stim means to you overall.