Emory is sick

So, I know we probably think way too much about our dog, and if you are not dog people, I can totally understand you thinking we are ridiculous (I would think that, too, if I were you).  But nonetheless, here it goes.  Emory is really sick.  It seems like just about ever since we've gotten her she has had diarrhea on and off.  Lately, she has been throwing up, too.  Yesterday I took her on a 1 mile walk and she was WORN out afterwards.  This just isn't normal for a 4 mo old dog.  I know it shouldn't, but it is making me so sad.  We've taken her to the vet, changed her food, made sure she doesn't eat any foreign objects (which is really hard), tried giving her pumpkin every day, several rounds of antibiotics, tested for every parasite possible, and nothing seems to be working.  I am so sad, because she's just a dog, you know, and we can't spend thousands of dollars on blood tests and surgery and crazy treatments.  Obviously, we would do all of these for one of our children... but she is just a dog.  All the same, the thought of losing her makes me extremely sad.  I start to think, how long can she last without absorbing any of the nutrients from the food she eats?  The past few days she has done nothing but lay around the house.  She is the sweetest thing, ever... she loves to cuddle and when we come home she gets so excited that her whole body is thrown back and forth by the weight of her tail wagging.  She never barks, never bites, and mostly leaves alone things that aren't hers.  I can't imagine us ever finding another dog like her!

If anyone has any suggestions, we are open to anything that doesn't cost us tons of money!

I'm at school right now and I don't have my cord to post pictures, but I will post some tonight.