Hello, I am eighteen years old, male, and for about a year now i have a slow (55-60 bpm) pounding heart beat, but that is not my main concern, whenever i stand up, sit down, or lay down quickly my heart lowers to about 45-50 bpm and pounds extremely hard, i get extremely dizzy and it feels like my heart is just going to stop if i do not sit back down. It is really concerning me and I do not have insurance so i cannot visit a doctor.