I'm sorry that you're not happy, but I'm glad you expressed that so I can give you more information. First, the only eye antibiotic available online is terramycin. Here's a source:
I feel I must be honest with you. There is probably something more going on than an eye infection. An eye infection does not make a chameleon weak. Part of the problem may be that there is perhaps no UVB light. Check the broad-spectrum bulb to see if it specifically emits UVB. Without UVB, the chameleon will develop Metabolic Bone Disease, and die. Weakness can be a sign of MBD. Broad spectrum, full-spectrum, UV, UVA, DayGlo, and daylight bulbs are NOT the same thing. The light must say UVB. Also, UVB bulbs must be replaced every 6 months. After that, they still look fine, but they no longer produce enough UVB to do any good. Try to get a UVB bulb as soon as possible. A Reptisun 10.0 is a good brand. Also, be sure to check the temperatures in the cage. Wrong temperatures can result in serious illness.
I feel that without veterinary care, this chameleon's life may be in danger. I would hate to see that happen, so Im going to give you some first aid measures to take in hopes that they'll result in some improvement. Get some Pedialyte (made for human infants and available in discount stores and pharmacies). Prepare a shallow bath consisting of 1/2 Pedialyte and 1/2 water. Soak the chameleon for 20 to 30 minutes. Supervise closely the entire time. Repeat this twice per day. Lizards
can absorb fluids and electrolytes through their vents, so this will help with any dehydration that is present.
To get the chameleon to eat, try mixing some plain calcium powder with chicken baby food. Put a small dollup on the chameleon's snout. Many times, they will lick it off.
If financial aid would help you to see a vet, the following organizations offer that. Many offer to actually pay vet bills for qualifying people, while others have low-interest loans.
American Animal Hospital Association
Angels 4 Animals
God's Creatures Ministry
The Pet Fund
United Animal Nations
This site has links to more groups, but does include some of the above:
Here is a list of ideas for people who can't afford vet care:
I hope you'll get results with home remedies and the OTC terramycin.