Welcome to HCM
We understand your concerns
Here the pain on your left side might indicate heart troubles, lung troubles, pectoral muscle soreness or acidity. For each of these conditions seperate tests are available to properly diagnose it. Consult a doctor for a detailed check up.
From my assumption it seems like acidity reflux problem and anxiety
associated with chest pain
because it started after you had food which creates acidity.
Don't worry. Get tests done and conclude.