I'm sorry, I'm not really clear from the post, so wanted to double-check - is he eating anything at all besides the mealworms? Or just those? If he's not eating anything but mealworms, he needs to be syringe-fed until you can get him eating kibble on his own again.
Agreed with Annie - check with the stores for returning. I know Petco will, at least.
~*~*~ Kelsey ~*~*~
RIP my sweet Lily ~ 6/12/08 - 1/20/12