Do you have a syringe or eye dropper? Early on I almost lost a chick to dehydration, then found I could offer a very controlled amt of chick electrolyte water, literally drop by drop, using a dropper, and it brought him around. I think this was less traumatic than holding his head to dip his beak, and didn’t require much effort on his part. Plus, if there’s some kind of obstruction, a drop or two at a time would hopefully be easier to deal with, and easier to judge a response to, and may help tide it over until you can determine the problem.
Good luck!