Cat needs help

Hi my name is Freddy Couch and my girlfriend Lauren Molinaro's 6-year-old cat who was a rescue from Tabby's Place here in Flemington New Jersey has gotten very sick and we had taken her to the vet that did X-rays of the heart and stuff and couldn't really find anything but she hasn't eaten in 3 days since then and lately she has been throwing up blood so I'm taking her back to the vet as soon as they open at 8:30 this morning. I have the finances for a second check up but Talia needs any kind of surgery or anything like that I just don't know what I would have to do except have her put down. 4 days ago the cat just had a check up a month ago and was in great health and all of a sudden out of nowhere she just started walking sideways she couldn't control her movements and falling down and that's when we took her to the vet the first time. She is walking normal now but since the vet visit she hasn't eaten anything but she will drink water and whatever she's throwing up is just coagulated blood from her stomach so in about 15 minutes I'm getting ready to take her to the vet and see what's going on. It kills me to see her suffering like this and I just don't know how Lauren will handle this , especially her being so young still. Lauren is devastated already just knowing Talia is suffering . If needed the money would be used for Talia's treatment. Any help will most defiantly be appreciated. We will know more soon. Heading to the vet now. Thank you so much