I am experiencing irregular heartbeat, dizziness (better by: rest) (worsened by: changing head position, after exercise, sitting upright) , vomiting and heartburn (gerd). the following also describe me: nausea, lightheadedness, fatigue, rapid heart rate,

Irregular heartbeat: Go to the Emergency Department as soon as possible and not to an urgent care

Rapid HR: If you’re having those symptoms along with a persistent rapid and irregular heart beat, then you could be having a significant problem with your heart rhythm. You need to see a Cardiologist, and if you can’t get in to see one today or tomorrow then you should go to the ED. Regardless, the heart rhythm issue needs to be elucidated.