What are bezoars?

I got some carafate from my doctor. I could not describe my irritable stomach. I remember getting hairs in my mouth when cleaning around her house & especially in the kitchen. I let her attempt cooking but it gets very messy. I am not sure what I ate at times because I was so hungry. ( My mom 87yrs+9mths is a victim of severe glaucoma.) She does not see the food left behind in cups and on plates when she puts them back in the cabinet.