I'v had Rambo for about a month and a half now, and he's eaten everything I'v given him since I got him. I estimate he's about 6 months old. he hasn't eaten in 3 days now, he won't even eat crickets! last night he was gagging like he was gonna throw up, but he didn't. and he's been slow too. he's usually so fast I can't keep an eye on him. Please help.