I myself have severe GERD and I also get the chest pressure as well as heart palpitations when I get a severe flare up. The reason for this is that the vagus nerve can get irritated from excessive acid and then this can irritate the heart. Not serious, but very scary, I agree! (Of course if this continues it never hurts to rule out a heart issue) If it were me, I would not blame the liquids, but the cocoa! Chocolate or cocoa of any kind is a huge GERD trigger (it loosens the lower esophageal sphincter which is supposed to keep acid down). Also, I can never lay down flat, particularly when I have GERD. I know this site does not encourage restriction, but if I were you I would avoid all chocolate for a while until the GERD dies down, and try sleeping propped up a bit. I hope this helps!