Hello.
Thank you for asking at HCM.
I went through your history and would like to make following suggestions to you:
1. In reply to your main query, Yes, it is possible that you could be allergic to fish.
Personally, I would suggest you to go for skin testing or serum specific IgE to fish to confirm/support your allergy.
2. If both of the reports are negative, it is very much possible that you may have
histamine fish poisoning.
It caused by consumption of improperly preserved (improper refrigeration) fish. The symptoms are more or less similar to allergy, but it is not an actual allergy, it is a kind of food poisoning.
So, if your testing is negative for
fish allergy, you could take a chance by eating fish from a reliable source. For fish allergy, the best strategy is to avoid it.
Hope above information will be helpful to you.
Should you have any further query, please feel free to ask at HCM.
Wish you the best of the health.
Thank you & Regards.