Jahel, just so you know, in a 44g tank, you're limited to 4-5 small fish. Tangs, and Angels (Even Dwarf Angels) require much more swimming room then it can provide. My best guess on the ich outbreak is due to stress from so many fish in to small of a tank. Fish like to establish territory (Especially Clowns and Damsels) and they will fight anything that comes into it (ESPECIALLY Clowns and Damsels). Sorry about your loss, and I'd stop buying fish until you can replace the damsels.
Also, on a side note, what type of Damsels do you have? Any Dominos? Because Dominos are HORRIBLY over aggressive, and will kill fish without thinking twice.