Hi there, I have anxiety disorder and sometimes my heart gets to 135-150 bmp out of nowhere. I have as needed metoprolol for that but, does anyone have any other tips and tricks to lower HR naturally? I did/do cold shower, breathing exercises, psychological sigh, valsalva maneuver, etc.  Thank you! * I was diagnosed with anxiety after an SVT episode which led me to the emergency room. Before the SVT episode, I did not have any anxiety/depression *