Hello! Thank you for asking on HCM! I understand your concern. In my opinion your symptoms may be related to an allergic reaction or intolerance to the food you have been eating. Sometimes the intolerance to the food can cause similar reaction of the body and fish consuming is a known trigger. The fact that you felt better after vomiting is another argument in favor of this diagnosis. Did your measure your blood pressure during this episode? Did you have abdominal pain or any swelling of lips, any rash in the body? I recommend you to consult with the allergologist to perform some allergy tests. I would recommend you to take plenty of water and juices today and avoid fish for some days (until the allergy tests results come). Hope to have been of help! Greetings! Dr. Aida