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You could be allergic to the proteins in certain fish which is best avoided. You can try prawns which may not give you the same reaction. Stay away from shrimps and lobsters as they could result in anaphylaxis
as well. It is understood that certain kinds of food poisoning
are rampant among fish from salt waters which can lead to bloody diarrhoea as well as can be fatal. Fresh water fish may be less harmful. If you experience shortness of breath
and feeling of the throat closing p it could be anaphylactic reaction
for which you will need Epinephrine
to prevent fatality. Consult your Doctor about the chance of you having this reaction as well and be well prepared.