I'm experiencing something odd and could use some advice. Lately, when I wake up and start walking, it feels like my heart is racing, and I get a bit breathlessbut only the first time. If I lie back down for a bit and then walk again, I feel completely normal. Is this something I should worry about in terms of my heart? I've had an ECG and a 2D Echo, and they both came back normal. I also saw a pulmonologist, and all tests were fine. What could be causing this?

"Based on your symptoms and the normal ECG and 2D Echo results, as well as the evaluation by a pulmonologist, it is less likely that your symptoms are due to a heart issue or a pulmonary problem. It is possible that your symptoms could be related to orthostatic hypotension, which is a drop in blood pressure that occurs when standing up from a sitting or lying down position. To help alleviate these symptoms, you can try increasing your fluid and salt intake, wearing compression stockings, and standing up slowly to allow your body to adjust to the change in position. In some cases, medications like Fludrocortisone or Midodrine may be prescribed to help manage orthostatic hypotension. If your symptoms persist or worsen, it would be advisable to follow up with your healthcare provider for further evaluation and management."