I brought him to see the vet early yesterday morning. The vet told me maybe he has consumed something such as insects (cockroach or lizard). The dormant protozoa in every cat's stomach unfortunately reacted to what he consumed causing irritation to his internal system. Hence the vomiting. The blood test also showed some of his red blood cells are no longer in normal shape; indicating the presence of parasites & bacteria.
Chompok has refused to eat nor drink. He looks extremely weak I nearly burst into tears upon seeing his droopy eyes. He was given six injections consisting of water, antibiotics, vitamin & God knows what. He was prescribed with a medicine to stop him from vomiting. But I didn't give him because he stopped vomiting after the injections. Chompok is a fighter. He didn't even fight back when the needles penetrated his skin. He sat still; while looking at me. I told him to get better asap so we don't have to see the vet again.