Chameleon is constantly dark

I have an 10 month old panther chameleon. He’s been consistently dark in color the last 2 days and keeps isolating himself to the bottom half of his cage. I’m trying to help him through a respiratory infection with antibiotics and burns on his back with Silvadene. He doesn’t look like he’s in good shape and the vets around here don’t know squat about chameleons, I’ve tried taking him in. Do you guys have any advice? I’m really worried about my little guy
 

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