MY duck started a high pitched squeak after she had some issues with opening her mouth and sort of coughing 3 days ago and I brought her in and watched her and the open mouth breathing went away but now she has this high pitched squeak for the past few days. Should I try to buy some antibiotics? If so, what kind and how much? She has a normal appetite but has not been getting in her pool very much. She is a only duck that I keep inside at night. She lost her brother and mother almost a year ago so she has not been around other ducks