my tegu is doing very badly. he has not eaten in about 2 weeks close to 3 now. he has not gone to the bathroom in a long time either.. he is looking like he wants too though. he is moving his butt back and forth like they do when they are pooping. but nothing happens. he is throwing up this slime and its really gross. he seems very lethargic. and the weirdest and most scariest part is his tail is dis-shaped and blue in the middle of it. its a lot skinnier than the base and end of the tail. it has shedded skin on both sides and it looks raw almost..!!!! i don't know what this is and im really really confused and i need help. its an argentine black and white and its about 14 months old. pleeeeeease help me i feel like he is dying!