What to do now? Besides take her to a vet. (We have taken her in maybe 5x since March, and all they've done is waste our $.)
Have you had an x-ray done? We were treating my old Border Collie mix for an eating issue. We changed foods, tried meds, did all sorts of things. A single, simple x-ray turned up a nasty mass in his throat and stomach. The poor old man had stomach cancer. I wish we had done that x-ray earlier. It would have saved him a world of silent suffering.
We put him down that day. It was so hard, but it was the right thing to do. Six months later, I still have a Border Collie shaped hole in my heart. It'll probably be there for the rest of my life.
Please keep us posted on your furbaby,
And Rest in Peace, my dear, sweet Tag.