My cat started getting virus like symptoms of being very lethargic and a temperature. We brought her to the vet three times and he gave her three doses of antibiotics none of them worked so we think it may be viral . He said she has very low blood pressure due to her not eating . We’ve tried to finger feed her cat pate and she eats it like that but she is very weak and can barely walk , she is drinking a lot . She has a blocked nose and seems to have lost a lot of weight . What should I do?