I have started to feel a fizzing or vibrating or buzzing in my heart. It s not at all strong. Someone has described feeling vibration in the chest like a cell phone on light vibrate. I have arrhythmia which is controlled with beta blockers. I don t know if the vibrating is connected. I m conscious of it now every few minutes. I ve had a couple of Holter monitor tests because of palpitations earlier this year but nothing abnormal showed up but this fizzing is something new. I have also been struggling with anxiety and insomnia over the last 10 months.