I found a cat about a year ago outside of my workplace. I noticed she had several wounds and could not walk properly. After taking her to the vet i found out that she had been attacked by other cats. The vet had to put a cast on her right leg. He told me that that was the only major problem and that everything would be fine. I decided to keep the cat. I struggled to find a brand of food she would eat and she would sleep all the time, very typical for a cat. One week she would be fine but then begin to vomit the food and not eat, so i would buy her a different type. I did this about 6 times with different types of cat food and each time it was the same. I then noticed the cats belly was swollen and thought maybe she was pregnant but the vet had told me that she had been fixed. Me and my mom thought maybe he had been wrong and kept thinking she was pregnant. About a month later i woke up to a trail of blood from the cats bed to her litter box. My cat was thrown on her bed asleep and breathing. My mom told me that it was that she had lost the kittens but we never found anything that would appear to be kittens only blood. After we searched to see if we could find anything i went back to the cat to take her to the vet and found her dead. we decided to bury her and just leave it at that but now i am left with the question of what was really wrong with her.
I'm sorry this happened. I would guess your cat suffered a parasitical stomach invasion...but what also jumps to mind is an ulcer.
The likely option could be a kidney/liver failure due to Feline Leukemia. What your describing is common symptoms of improper liver/kidney functions (vomiting from eating, etc) , and untreated the bleeding and bloating or pretty typical results.
Feline Leukemia is very common with stray cats.
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