I use Metropol. I take a 50 mg time released tab and have 25 mg one as well I use if it start to act up prior to retaking my 50 mg again. That is daily. I have SVT. (Super ventricular technic Cardia). Not sure if that was spelled correctly. I have had this since 2008. Been by ambulance to ER about 6 to 8 times. They have to restart my heart with an injection or paddles to get it back to its normal rhythm. That’s always fun. The Metropolol helps but I still get quick spells daily. I can typically stop them myself. Have they told you about holding your breath and pushing down??