Why do I feel like the ground is shaking or there's an earthquake when I'm sitting or lying down? I've had this feeling for at least a year?

And I've been to a psychiatrist and a cardiologist, but they both said there's nothing wrong. I'm fed up with this feeling! Sitting and lying down has become impossible for me! What am I going to do about this? I'm taking different psychiatric medications and two vitamin supplements together. Could there be an interaction between them, or is it related to stress/anxiety?

Why do I feel like the ground is shaking or there's an earthquake when I'm sitting or lying down? I've had this feeling for at least a year?
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