i took him out just to check on his mouth and he seemed relaxed and chillied up my sleeve so i let him be. when i put him back in his tank he started to take a look around and found his water dish that i just changed the water out of (tap water, same that i drink). he took a big drink and after about 5 minutes threw it all up. he has not eaten since about november 4th (before i got him, i have yet to feed him [offered him a mouse and he didn't take it]) do i need to get him to a vet?