I'm really not experienced with chicks; we just had our first hatch. Our chicks, especially the later ones, took a long time to hatch. What I read was that most chicks can hatch within 24 hours. Ours were within that time-frame. They didn't walk too well either, just kind of got around any way they could until they got stronger.
Is it in a brooder? Is it fluffed out yet? Is it peeping? Ours really slept a lot during the first few hours. You could offer it water and see how it responds. Are there any other chicks that you can put in with it? I'm sorry, but I really don't have anything concrete. I've had no experience with sick chicks. For ours, I had to teach to first two how to drink by dipping my finger in the water and letting the chick drink the droplet off the tip of my finger. Oh, and what's the temperature in where the chick is? I'm praying for your little one!