is very different from allergy to meats (be it chicken or pork etc) therefore do NOT ignore the symptoms that you had as they can become serious the next time if you have true seafood allergy.
You have not mentioned symptoms like feeling hot, tingling
in the mouth or rash (itchy) other than the chest pain
which could mean an asthma attack. If you have asthma, then getting to the root of the problem is more important.
Skin prick testing or specific IgE blood tests can diagnose seafood allergy and blood testing is recommended as first line.
If positive, you need an anaphylaxis
management plan in place with antihistamines, steroids, adrenaline