<s>[INST] I have sever gas around my heart causing my heart to pound when I lay down. Nothing seems to help except getting out of bed. This has been going on for a few weeks. I do have Afib but I am under a doctors care,medicated and doing well. What could this be? What can I do? I am unable to,sleep. [/INST] hello,I have gone through your query.Thanks for using HCM.IN fact your symptom of gas especially while you try to lay down may be repated to heart.Please discuss with your cardio.If it is ruled out then you may consult a gastroenterologist to consider Acid reflux.My best wishesDr.Rajesh Teli,MD. </s>