Is it normal for one of a cat's eyelids to stay overlapped during illness?

I've gone to the vet, and they have no clue what the problem, and they've only given me eye-drops. Until I have the money to see a "kitty eye doctor," please don't answer with, "Go see a vet," I just want to know if anyone's encountered something similar to this for their pet.

My twelve year old kitty has a slight fever. He won't move from his spot behind my door, and he won't eat or drink unless I bring both necessities to him. One of his under-eyelids is slightly overlapping one eye to where he has a "rolled back lazy eye" look, and his ear - on that same side - is drooping. It's almost as though the side of his face is sagging. He's not feeble or weak when he DOES move about, but he mostly spends his time being "bed-ridden." The vet still doesn't believe it's anything big and tells me to stick to eye-drops, but he hasn't improved other than his temperature going a bit down. I would just like to know if anyone else has ever encountered this to share their experience? Because for some reason, my other cat is slowly starting to get the same symptoms with his eye. I had put, "Sentry Natural Flea Defense" on them three days ago, and they've started to show these symptons during the third day, yet I don't believe flea repellent should cause this effect. It almost looks like a contagious pass around.
I've actually checked with the ingredients on the product, and so has the vet: it's all natural plants. We did call the company number, but they denied the case being the product and gave a, "take it to the vet" response.
Product Ingredients: Peppermint Oil, Clove Oil, Lemon Grass Oil, Canola Oil, Vanillin, Citric Acid. <-- The vet said these were all fine, so he couldn't specify the problem being anything other than a possible allergic reaction. I have five rescued cats - the eldest [twelve] is the one with the problems, the second oldest [ten] is indeed showing similar symptoms a day or more after the eldest did, but the second's brother [also ten] is fine, while the youngest cats [one and two] are also fine.
 
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