Sudden swelling on right side if throat. Did eat sone shrimp but no kbown allergy. Please advise?

Sea food allergy. You may have sea food allergy. Seafood, common in the U.S. Diet, includes fish (cod, salmon and tuna, for example), and shellfish (shrimp, crab and lobster, squid, scallop, clams, mussels, and snails). Abstinence is the best treatment.