I've been experiencing these weird palpitations for the past four months whenever I lie down, and I'm really starting to worry. I had my blood pressure, thyroid levels, ECG, and an echocardiogram checked, and everything came back normal except for the ECG showing sinus tachycardia. Also, I had Covid about ten months ago. I'm not sure what I should do next. Any advice?
Given that your BP, thyroid, ECG, and echo were normal, but you are still experiencing palpitations, particularly when lying down, it is important to further investigate potential causes. Sinus tachycardia can be due to various factors, including stress, anxiety, dehydration, or even residual effects from a previous COVID-19 infection. Since you've had COVID-19, it could also be related to post-viral syndrome, which sometimes affects the heart. You should consider consulting a cardiologist for a more detailed evaluation, which may include a 24-hour Holter monitor to track your heart rate variability over a day, especially during sleep. Additionally, ensuring adequate hydration, managing stress, and avoiding stimulants like caffeine might help reduce palpitations.