My cat is sick, skinny and wobbly?

My cat Spooky (female 14 year old black cat) has been sick for a month, throwing up almost every single day. We took her to a vet and they did a blood test to see what’s going on with her. It came back perfect. Nothing wrong with Spooky. They did give us nausea medicine (Cerenia) and it worked for a bit. When we ran out she started throwing up again and the vet supplied us with more medicine. Spooky has become very thin and boney. She also is having trouble balancing when she walks. I looked up the side effects of the medication and it said that depression and anorexia were side effects of the medication… I don't know how much to trust the validity of the internet if that’s true. We took Spooky off Cerenia and she’s slowly starting to eat again but still throws it up. She’s been off for about a week now but all of this came on so fast and I’m worried about my Spooky girl. I don't know if this is relevant but a year ago she did have an anal glad burst…

Please help. I don’t want to loose my Spooky girl just yet.
My cat is sick, skinny and wobbly?
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