do you mean he has discharge coming from his eyes? are his eyes white?

you can buy antibiotic feed for poultry at feed stores, and fleet farm. there is also antibiotics for their water, which i suggest doing that first.

I would keep Sunny seperate from your other ducks, as he may have an eye infection which is very contagous. (sp?) as for the throwing up, i am not sure about that. make sure he's drinking lots of water.

Prayers coming, hope you get better Sunny!!