sick? 10 week old

[Trefoil]

I have a 10 week old polish that I put out side ( with a light for heat, cause its cccooooldd here) 2 weeks ago. Last week I noticed that it was sleeping everytime I saw it and wasn't moving around like I thought it should. After waiting a couple of days, watching it, I noticed that the keets it was raised with were picking on it, it had always been the leader before, and it was getting colder, so I brought it in the house. I'm not sure how it happened or when but its top beak is broken off very short. Its been in the house for 2 days and is still very quiet, sleeping a lot and not moving around very much. I am giving it vitamins and it gets acv in its water, is eating and drinking but there must be something wrong with it, I just don't know what. It should be freaking out at being alone, but it doesn't seem to notice.
- should I bring in another chick for company?
- any ideas on what its problem is and what I can do to treat it?
- should I worm it, just in case?
Any ideas would help, thanks.

 

[Eggcessive]

It is still at the age where it can get coccidiosis. The symptoms are diarrhea, fluffing up, ruffled feathers, sleepiness, and poor appetite. Treatment is Corid (amprollium) 1-1 1/2 tsp powder or 2 tsp liquid in 1 gallon water for 5-7 days.

 

[Trefoil]

It has everything but the diarrhea. Thanks, I'll try it.