Shrimps and newly planted Cryptocoryne or damaged, dying or dead Cryptocoryne do not go together. Cryptocoryne seems to be the common denominator for the "introduce new plant, mass shrimp die off" syndrome.
Cryptocoryne sap (I suppose it can be called sap) is toxic. Take a Cryptocoryne leaf crush it and rub it on the sensitive skin on the inside of your fore arm. Chances are you'll get a rash and itching within half an hour. Washing with water usually stops it.
I can't really tell you how to save your remaining shrimp, but in my experience, usually those who survive the first day or two will survive. A water change will help. Personally, I'll leave the plants there.
I'm going to take a leap and say never introduce new Cryptocoryne to a tank with shrimps.
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