Your history seems to be acid peptic disease(acidity), a problem in the stomach. U may continue the medications for its relief. It is unlikely to be a muscle pain
. Avoiding spicy food, junk food,coffee,cold
, alcohol and taking soft food will aid relief. Also make sure that you don't have respiratory infection in recent past. If chest persist still , it is advisable to go for chest x ray
and an echo cardiogram.