Melt down

I'm just feeling really guilty right now. I completely lost it tonight. My son would not stop screaming. He was crying for hours no matter what I did. So I yelled at him so bad. I didn't shake him or hurt him. I put him in his crib before I got to that point. He just looked so heart broken and sad because I yelled at him. I got us both settled and he's sleeping peacefully beside me. I just can't get that face he made when I screamed at him out of my head. I'm just crying right now feeling so guilty. I feel like the worst mother in the world.