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Feed stores carry worming medication.
If you can't find what you are looking for, some of the wormers that are recommended here on BYC are found in the cattle section. Also jefferslivestock.com is a nice website to buy from.
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She feels light to me, but looks pretty large for a chicken. She has been puffing up, but I am thinking it is because it is cold here. Today was warmer than normal with a temp of 35 for a high.
Some vets will do a fecal test for worms and coccidia for a small fee.
Keep in mind that the following is just giving you links that might be helpful in the future. I have no idea what is wrong with your hen.
http://edis.ifas.ufl.edu/ps031
eyes
http://edis.ifas.ufl.edu/ps044
diagnosis charts at bottom
I am sorry that I don't know what is wrong with your hen's...