[Porsche-O-Phile]

They didn't do any blood or urine tests?

One of my cats had similar symptoms (occasional puking, lethargy, etc.) a couple weeks ago. Took her down and blood tests revealed an elevated WBC count and high kidney markers (creatine, etc.) Kidney infection, prescribed antibiotics. She's doing 1000X better now.

Maybe time for a different vet? Cats are very prone to UTIs (Urinary Tract Infections) and other excretion problems. Another thing I've read about is blockages if they get into yarn, string, feathers, etc. Their digestive tracts can get plugged and they end up puking up a lot. Is she pooping regularly? Stuff making it all the way through or not? Could be very telling if not.

Dehydration is a serious issue if they're throwing up a lot and/or not drinking water. Make sure they get enough water! Very important with cats!