I have a chick that is throwing its head from side to side like shaking something off it's beck. It also is stretching it's neck out like it is trying to swallow something but can't get it down. It is very slow in it's walk and just wants to get under mom. It is 21 weeks old. It is drinking, put a little vitamins in it's water and has eaten a little chick feed but now it is been doing this stretching thing the past 45 min. Dose anyone have any ideas???