It must be the sandwiches undoing.sometimes after a heavy meal we do tend to feel agitated and present with complaints of chest discomfort
.this is very often confused with a heart attack
and most commonly is attributed to indigestion
and is specially compounded when taking a nap immediately after heavy meals.I would recommend you to finish your meals at least 3 hours prior to sleep-time,also going for small walks after meals is highly recommended.If problems with indigestion,acidity or flatulence
persists i recommend you to take a mild antacid before meals and drink plenty of fluids to get your metabolism
working.Hope this post answers your query and allays your fear.