What is wrong with my poor sick Corgi?

She has been vomiting somewhat frequently for some weeks now. The vet thought it was probably too much table food, so we locked her in the living room when we ate to keep our toddler from sharing his,dinner with her.

But now, for the past few days, it has gotten much worse. Vomiting several times a day. Two days ago the vomit came out almost pink. As of yesterday it is a very dark but vivid green and full of fluid. There were small soft oval nodules in her vomit, green on the outside and white inside. There was also a small object in it, a half-circle about as big as half a quarter, that reminded me of thin tree bark or old hard leather when I handled it. She has stopped eating (tried to eat some chicken ee offered her, but gagged), but is still drinking, though with the volume of fluid she vomits up I wonder how much is getting in her system. As of this afternoon she has become lethargic and a little weak, hesitating a while before jumping or climbing. Her vomit today has been free of any nodules, but otherwise the same. She is still using the bathroom as often as normal, but her feces is bizzare, pink and greenish, thin, and looks like chewing gum.

I am really concerned about her. We plan to take her to the vet tommorow, but I would like to know what we may be dealing with sooner, and if I can do anything to help her tonight, I want to. I am currently watching her for signs of dehydration, but aside from being lethargic, none yet.

She is our baby girl and we couldn't take it right now if something happened to her. Any ideas on what is wrong or what we can do, or any links or references are welcome. Thanks for any answers or info in advance, and God bless!