I'm 52 years old. 6 weeks following the initial 5 treatments I had 2 treatments and then 1 treatment 6 weeks later. I could feel the effects diminishing after 4-5 weeks. I had my last treatment on 11/18 and after a few days my hands went back to feeling near normal. The plan for now is to do 1 treatment every 4 weeks. If you haven't already done so, you might want to discuss your concerns re. your history of palpitations with your neurologist/cardiologist.