Leo got diagnosed a week ago, and it's unlikely he will even make it another week. Vets suggest to "stop his torture". Is there absolutely any hope?

For reference, Leo is just over 3.5 years old. He's always been a picky eater, but he recently totally stopped eating(1 week ago). We took him to our vet first, who suggested it could be a liver damage. He gave a few meds, and his condition did seem to improve as he ate a little, but soon enough, puked it all out. Then we took him to another hospital with better facilities and they suggested an XRAY. The XRAY revealed that he had fecal deposits in his large intestine, making it impossible for him to pass stool. The vet gave an ointment, and then he did pass some stool, but that's it. His condition has only worsened ever since and below is his blood report along with XRAY. Also, his weight dropped from 4kgs to 2.5kgs. It's all happening so soon, one week he was well and healthy and the very next week he is dying? Did we miss some symptoms earlier? | realise that the vets are no fools, but I'm looking for any speck of hope to extend his life. At this rate, he will not make it another fortnight. If any of you know a little regarding this, I'm looking for absolutely any source of hope and support before giving in.