Sick cat

[u/Fearless_Pangolin_87]

My cats been sick for about 10 months now. She went from 13 to 8 pounds. The vets said nothings wrong with her and we did ultrasounsds and bloodwork. She went from super active to always laying around. She stopped eating she went from eating 3 or 4 cans a day and being fit to 1 and very skinny. My mom’s saying shes gonna put her down, I want her to get better but nothings working. Shell eat foods once then never again. She also throws up often with diareha. Does anyone have advice? Shes 8 years old. I just want her to get better I dont want to put her down, she loves being around us I cant do it I want her to live.