My dragon has been a total healthy boy for the past 6 years today he was his normal self he pooped, was resting im his tank when he began to convulse and shake, saliva and bits of food came up from his mouth and he heaved like that for several seconds and was fine for about an hour and then he died. No movements in his stomach or chest area. He is cold and dead despite being alive moments prior. If anyone could help me understand I would appreciate it.