Hi everyone. My cat is 9 year old neutered short hair domestic 5kg cat (little bit chubby, but not fat). He suddenly lost apetite, started to vomit food as it was eaten, even a small amount and stopped passing stools, however, he urinates and drinks water well. The vet has done multiple blood tests that returned normal, X Ray that did not find any foreign bodies, ultrasound that showed all internals are in good shape, endoscopy that found nothing, GI tract biopsy that returned normal... However, the cat is under anti sickness medicine, barely eats, retching and gagging, and also not passing stools. Anyone has experienced something similar? Any ideas please?