I just saw this happen with my Uromastyx yesterday. I am not sure if this is the case but he ate a rose petal and did not chew it and it got stuck in his throat. So he started thrashing his head back and forth until it came out. Was really strange but it worked. Hopefully that's what happened. I would not advise giving a lizard a warm bath first thing in the morning. That's a really big shock on the system going from a body temperature of about 70 degrees to about 100 so quickly. Hope your little one feels better.