I wish I had seen this topic sooner. Sorry about that.
I've dealt with similar symptoms over the years, fortunately only a handful.
I highly doubt your little buddy will make it at this point, but I'll share what I would do at the stage he seems to be at. Please keep in mind I am not a Vet, I am just a fool who has been keeping Chams for 35 yrs as a simple personal hobby, never went professional, has worked in the Pet Industry, and like you never gives up on a sick Cham.
So a few things I hope may be of help to you.
- Mader was great when he was out here in California, if you could get some help from him it would be nice but like somebody else said already...the guy is freaking busy.
- Dr Greek, solid guy. Haven't met him in person since I haven't needed a vet visit in about 10 yrs but all my friends and the herp stores I use say he is the go to guy out here now.
Now back to Chams.....
Anytime a Cham goes off feed for 7 days, make that bug juice. I usually mix in 1/3 gatorade for hydration purposes. You don't need to fill the belly, just keep some small amounts of food in there so always go with small amounts. Keep the temps on the low side for the given species to help avoid dehydration during an illness. That's just personal observation over the years. I've helped with a number of sick herps over the years and with Chams, I found the ones that pulled through are the ones I kept in the lower day temp range, the idea of being sick and they need to be kept nice and warm is over rated when you consider dehydration. I'm not saying chill them, I'm saying if the species likes 82-90F then keep it around 82F is all.
Next, they need the hydration daily. Sometimes just a few drops will do it so don't go overboard. Some would say you'll stress it and kill it, however any sick animal that dehydrates dies too. Any sick Cham is a gamble, the trick is knowing your animal well enough to make the choice.
Based on what you described, the eye doesn't need to be removed, sounds like a systemic infection, also dehydration results in those eyes becoming sunken. Your best bet since you had the lab work done is to use the meds given. I would have asked for an oral version and avoided the injectable which in many cases can be done. Sticking chams is a bad choice unless you are dealing with one of the true giants and even then when I had a sick Parsonii, it was oral meds.
I am not trying to be the prick with bad news, however the average cham that gets to the point you seem to be at doesn't make it. Should you give up on the hobby? No. You clearly care for and appreciate these animals. People like you need to stay in the hobby. If he doesn't make it, dust yourself off and apply your experience to the rest of your chams. The school of Hard Knocks is what all of us go through if we are in this hobby for a long period of time. The end result is over time you find your animals are healthy and you yourself are less stressed.
Last bit of info, the dual infection you are dealing with is infectious. Make sure if you are not already, to be disinfecting your hands after dealing with anything from this animals enclosure. You not only don't want it to spread to your other animals, but Staph in many forms can be transmitted to you even if it is only a very small chance.
Sorry I wasn't able to post sooner. I don't usually do so anymore but your info is stuff I've seen over the years.