Do you have reptile stores in your area? Sometimes they will board pets.
5 days is not a long time. All you really need is a way to make sure the water drips and the cage drainage doesn't over flow. If your chameleon is a juvenile, you'll probably need to have him fed at least once.
Are you sure there's no one who could handle that? It doesn't have to be perfect care, it just needs to be adequate care.