Take her to your vet tomorrow, and also find a holistic vet.
Since last night she has had an extemely bad dry, hacking cough. Its like she is trying get something up but she cant.
There are appetite stimulants and anti-nausea medicines that might be efficacious in aiding your dog . Appetite stimulants include Periactin, Mirtazapine, Steroids, Diazepam, and others. There are quite a few anti-nausea medications such as: Reglan, Promethazine, Dramamine and many more. If your dog feels nauseous after eating a certain food she will associate that meal with feeling nauseous and will never eat that food again. She could be placed on an appetite stimulant and anti-nausea medication simultaneously.
If all else fails a consultation with a holistic veterinarian who is familiar with acupuncture and Chinese and Western herbal medicine may help. Check with the American Holistic Veterinary Medical Association, or the Chi Institute, or Google holistic Veterinarians.
The Chinese herbal formula: Jade Lady (Yu Nu Jian), Happy Earth (Xiao Yan San, and Er Chen Tang), Bao He Wan, or Eight Gentleman, are all good appetite stimulants herbs, and help with nausea.