I'm sorry Hunter's symptoms have you worried. It's important to know if he is drinking and urinating, because male cats are more prone to develop urethral blockages which prevent them from urinating at all and this is life-threatening. Here is more information:
I'm assuming the vet did not collect urine for a urinalysis, because you only mentioned the blood test, but I hoping he felt his bladder and if it felt very full, he would have expressed (emptied) it and if nothing came out or Hunter seemed to be in pain, the vet would have explored a blockage further.
He may have an oral or dental problem that's causing discomfort when he eats. Again, I'm assuming the vet checked his mouth. He could have something stuck under his tongue or on the roof of his mouth, or between teeth.
Oh, I just got your reply and thanks for letting me know that he finally ate. Try to get him to eat something that's not on his forbidden list. Try some baby food meat, containing NO onion or garlic products. Beechnut Stage 1 Chicken or Turkey are good ones.
Continue to monitor him and offer him some tuna water to lap up, then some tuna.
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