My cat had been vomiting once daily for about a week. The vomit was clear foamy liquid or tan liquid. I thought it was a hairball at first, but no hairball materialized, and then her appetite decreased to zero. (She is a light, uneven eater normally, so it's a bit hard to tell when her eating is truly off.) Otherwise, her behavior was normal! Pooping and peeing normally. I took her to the vet. She ended up having an ultrasound, but it was normal. The vet gave her fluids as she was a bit dehydrated, and we gave her an anti-nausea drug for a few days. She improved, started eating, no vomiting. But a few days later, she stated vomiting once daily again, stopped eating--same pattern. Back to the vet for bloodwork this time, which showed concerning creatinine and bilirubin levels. We hospitalized her for 24 hours, another ultrasound (normal), more fluids, more bloodwork (which was closer to normal). Vet says it *may* be gastroenteritis. $3,000 later, still no real answers. Checked her out of the hospital. I scoured the house for clues, and found a plastic bag that she had been chewing on. The next day, she gobbles down a bunch of food because we applied an appetite stimulant (prescribed by vet) and she immediately threw up the undigested food along with a large HAIRBALL. The hairball was different - shiny and fresh looking hair, and very large diameter -- unlike the other skinny bedraggled hair balls that I have seen in the distant past (she very rarely coughs up hairballs). She was then fine for about week. But over the weekend, she started the pattern again. She slept more than normal on the weekend and ate very little. Yesterday, she threw up some clear fluid with some small wads of fur in it. Then this morning she threw up more clear foamy fluid and was grouchy (although her general behavior has been fairly normal during this entire ordeal). So, do you think this whole thing could boil down to a hairball issue? We are going to try some hairball remedy, which we have never done before. But if she doesn't get better in a couple of days, back to the vet we go. Any thoughts, based on your own experience?