Did the child ever tilt their head back? When you hold them and tilt i…

Did the child ever tilt their head back? When you hold them and tilt it back, and when they lie down, sometimes they tilt their head back. We need an appointment with a neurologist on the 16th. We've also been having trouble sleeping lately, even on our arms, we wake up every five minutes, doesn't cry while waking up and then starts crying. I don't understand what's wrong with him, it's definitely not colic...