21 year old male, 6'2" and 155 lbs., no significant medical history except a slight shellfish allergy in the past (resulting only in pimples on face) Currently in Mexico and have eaten quite a bit of shellfish. Approx 1 hour after eating shrimp, I erupted in hives all over my chest, back, and upper inner arms. After taking benadryl and putting on cortisone cream, the hives are quickly disappearing. Dinner was approx 6 hours ago, breakout was approx 5 hours ago, and I took benadryl approx 4 1/2 hours ago. Am I at risk for my throat swelling / anaphalactic shock? Has the time period for throat swelling ended?swelljngswrlljng