Your best bet would be to have your TA call the cruise line and ask. If you get into a situation where your epi-pen doesn't help then you would have to know if the ship is equipped to handle a severe life-threating allergic reaction.
My doctor and his wife went on a cruise and she had a severe allergic reaction to shrimp. She had never had a reaction before. He went with her to the ship's doctor and told me afterwards that they did everything right. He said she could not have received better treatment from the best ER...or even from him!
Just a bit of reassurance.