Can anyone give me some opinions?

My indoor cat 12years old started acting sick on sunday took him to my vet yesterday 400 dollars later they took blood which came back normal .  Vet sent me home with some meds for nausea since hes been vomiting not eating just out of the blue .   Has anyone ever experienced this  with thier cat.  Gave him appetite stimulator now just watching him he is not himself . 

 

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