my duck has been so sick that she can no longer walk I am proping her up with a makeshift 'nest' made of towels, if i don't do this she ends up on her back with her feet in the air. she has lost most of her body fat and will only eat or drink if we hand feed her we gave her antibiotic injections but that did not work also tried vitamins. She continues to breath as if he is panting. At this point she has a foul oder about her and is atracting flies. What do i do?