OP, I have an anaphylaxsis allergy to all seafood [fish, shellfish, crustaceans, molluscs, cephalopods, etc]. I will react to airborne amounts if I am close to them [so I cannot sit within a couple people of someone eating seafood] or if there is a large amount in the air [unknown how much "large" has to be, but Red Lobster is not an option and make stakehouses are out too].
On our first Fantasy cruise, I had a reaction two nights before "lobster night". We were in Animator's Palate and I was halfway through my entree when I suddenly was itchy and having trouble breathing but did not know why. By the time I got my asthma inhaler out and had used it I was suddenly hit with what was like a wall of seafood smell in the air [it had not been there/noticeable before]. Then I knew why. I rapidly got up and went to the lobby which had fresh air. Our server and the head server followed me and were quite concerned. After a few minutes I felt much better and decided I didn't need the medical centre [probably not a wise choice, but it was the choice at the time]. Our server got the rest of my meal, including dessert, packaged up to go and I took it to my room to finish it. Before I left, the head server explained that two nights later was "lobster night" and almost everyone orders lobster. He said it will be much worse and suggested that I not eat in the MDR that night -- that they would arrange to have my meal brought to my stateroom instead. They did, and that is where I ate. My sister did go to the MDR because she wanted to see the second night at Animator's.
On our second Fantasy cruise, I had a milder reaction one night at Royal Court; our meal was brought very quckly and we were almost through our entree before everyone else got their shrimpy appetizer. This was helpful because we had to leave early because of too much seafood in the air.
I highly suggest contacting
DCL Special Services and having a talk with them. They should be able to tell you the menu rotation [perhaps not far out, but at least closer to the cruise] and may be able to help with getting Palo the right night. Also, you can talk with them about other options that may be available . At the very least, the alelrgy should be noted on your reservation.
We also talked with special services about having our own table, and that has been granted each time [since nobody at my table can be having seafood, it isn't fair to strangers to limit their menu choices].
SW