Does anyone out there have a shell fish alergy?

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Years back I was in Vegas and ate crab legs and later I broke out but didn't know if it was from crab legs or something else since I was out of town, in a hotel and eating foods I don't normally eat. Well I love seafood salad and always eat it at resturants when I go. I know they usually have imitation crab meat but never thought much of it. Well last weekend I was at a china buffet place and ate the seafood salad. We then went shopping and suddenly my throat felt odd and I was having a hard time swallowing. I told my family we needed to go cause I wasn't feeling the best suddenly. When we got to the check out I grabbed a soda and had it almost all gone by the time we hit the car which in itself was odd for me. I still felt odd and noticed I was having a hard time catching my breath. I looked down to see blisters forming on my arm. I quickly said I needed benadryl and we head to Walgreens. I had luckly only eaten a couple spoonfuls of the seafood salad I am sure if I had eaten my usual amount I would have been much worse. I got home and went right to bed. I have to tell you that is a scary thing. I don't really have allergies like that so it shocked me. So those that have it what else should I be watching out for? Will the reactions get worse if I accidently get it again? I really love crab :(