Hello.
Allergy to the Tuna could cause such a reaction. However, you can visit your GP and get it evaluated. Anxiety may cause flushing of the face, but it usually subsides after a few minutes. Your symptoms appear to be due to the allergic reaction.
Hope this helps. Take care.
Abhijeet Deshmukh, MD
(This post is for the purpose of providing medical information and is not a substitute for a face-to-face consultation with a doctor. This post is not intended to give or rule out a diagnosis, create a doctor-patient relationship or replace an existing one. I am not able to diagnose medical conditions online. Please consult with your doctor or a qualified healthcare provider for diagnosis and treatment options)