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Sorry not sure what species of sword it is- try posting in the planted tank section and you'll get more responses. Swords are very heavy root feeders though and benefit from adding root tabs in the substrate underneath them. If you are not doing this, that may be the source of your problem.
Yea that's why, amazon swords are root feeders, meaning they get their nutrition from their roots, not from extracting it like other plants, without root tabs, they surely will die, you need to add some, pronto
Give it a week or so for it to pick up and start to look better. Swords will grow new leaves quickly. Just remember to cut off any damage leaves so that it doesn't waste energy trying to repair they damaged leaves.