I've been feeling my heartbeat in my stomach when I'm lying down, and it's like my stomach moves with each beat. My ECG came out normal, so I'm not sure what's going on. What steps should I take next?

This sensation could be due to a condition called pulsatile tinnitus, where you perceive your heartbeat in your abdomen. Since your ECG is normal, it is less likely to be related to a heart issue. However, it is important to rule out other potential causes. I recommend you consult with a healthcare provider for further evaluation. In the meantime, you can try managing stress and anxiety, as they can sometimes exacerbate this sensation.