Dear Welcome to HCM We understand your concerns I went through your details. I suggest you not to worry much. The given symptoms are typical for aniety disorder and related obsession. You are feeling your heart beat while laying down because you are now hearing it . It was there earlier too, but you were occupied otherwise to notice it. Now because you are worried / anious about your health you notice the heart beat. Belching and acidity and acid reflux could be controlled by including some boiled garlic balls and ginger with your meals. Exercise, yoga, meditation etc are good for streamlining thoughts and metabolism. You need counseling and psychotherapy. I shall provide you with the required counseling and psychotherapy techniques online, to overcome these problems. Please describe the whole problem in detail and post a direct question to me. Hope this answers your query. Available for further clarifications. Good luck.