What area were you treating and did the feeling of jolts happen sporadically or throughout the treatment? It is not normal to experience what you describe throughout the treatment.
When I was getting my feet cleared there is a spot in the ankle where the Peroneal nerves branch out and any time that spot would be cleared, I felt the full body jolt and involuntary reflex where my foot would kick up, almost hitting the electrologist in the face. Every time we had to clear that area I was scared of same jolts. That would happen when Thermolysis would be used in the area but less so with blend. I’m not sure why.