screaming while eating.

Hannah
It's been about a week. She cries like eating hurts. She fights eating during the day and doesn't really nap long either. She's up every 1 1/2 - 2 hours at night and eats just fine! I'm so tired no sleep sucks. She sort of takes my right breast better than my left. She's 4 1/2 months old. I took her to the doctor this past Tuesday her doctor said her throat was a little red. Anyone have and ideas what it could be??