Go through these in order and stop at the first one that applies. If you are reading this for someone else, answer for them.
Get emergency medical help now for sudden severe chest, neck, back, or upper abdominal pain, especially after forceful vomiting, an endoscopy, an injury, or swallowing an object.
New breathlessness, fever, rapid worsening, faintness, confusion, neck swelling, or crackling under the skin also requires emergency assessment.
Do not eat or drink while waiting for emergency assessment if a perforation is suspected.
Do not make yourself vomit or try to remove a swallowed object yourself.
During recovery, seek urgent help for increasing pain, fever, shortness of breath, repeated vomiting, new swelling, inability to swallow saliva, or fluid leaking from a wound or drain.
Routine follow-up can address gradually improving swallowing discomfort, diet changes, feeding-tube care, or returning to work and exercise.
Keep appointments even if you feel better because imaging or stent removal may still be needed.
Every sign above is quoted from the sofidex article on Esophageal perforation. If you are not sure, err upward — it is always reasonable to be checked.