Gout can be caused by too much protein in their diet. I would suggest watching the protein levels in the gutload and I would also recommend making your own gutload and greatly reducing the protein until you can get to a vet. It makes monitoring what's in their diet instead of relying on flukers. Chameleons have a very slow metabolism so you won't notice any improvement right away, but it could help prevent the symptoms from escalating. There are some good gutloads that you can purchase, but just pay close attention to the ingredients and I wouldn't rely on those alone. Just my two cents.
Also a side note, if you find a vet, when you call to set the appointment, see if you can request a call back from the vet and see if he/she has care suggestions based off their symptoms until the appointment. We are fortunate enough to have a vet we can talk to on the phone with any concerns.