I am undergoing what appears to be an allergic reaction to food. I recently ate sashi-grade tuna (pan-seared only) and edamame (boiled, salted soybeans). I got a sudden, throbbing headache, severe flushing all over my body, and diarrhea. No shortness of breath or constricted airway, though. I ve taken 2 Benadryl tablets. Do I need to go to the ER?