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The medicated chick feed may be a concern.  As far as I know, amprolium is said to be okay, though many people don't use medicated feed for ducklings as it is not necessary.  But what you are saying is in the feed does not sound like amprolium.

Storey's Guide says use 100 to 150 mg niacin per gallon of drinking water for several weeks.  Plain niacin, not timed release or no-flush.  If you cannot find that, you coukd try B Complex, and use the amount of niacin as a guide.

Nutritional yeast is another option.  People often use a tablespoon nutritional yeast per cup of food just as a standard duckling diet - you may want to double that. 

Improvement is often seen within a few days.

Meanwhile, if at all possible, a good duck vet is best.  Ducklings can survive rough situations if they get the right help in time.