Dog throwing up for 9 days and not eating?

5 yrs old american bull dog,9 days ago started eating her food very slow, she did this for about 4 days then stop eating and has only had about half a cup of plain can dog food, xrays on her stomach and intestines are clear of blockage, blood work came back normal, she will drink water but i can only give her about 1/2 cup at a time, the smell of any food makes her want to throw up now, she is loosing weight, vet has given her pills for her stomach and pepsid, if she throws up now just liquid , no blood shown and is urinating. Just wandering if any one else has had same thing with their dog.