Screaming 4 month old.

My 4 month old used to be the easiest going baby😊☀️. She didn’t cry unless she was hungry or pooped. I think she’s getting a tooth and she literally just screams and screams every evening more often than not. 😥 She’s also going through a leap. During the day she’s pretty happy, but as soon as the evening starts to set in she turns into a different baby. I feel so bad for her and I don’t know what to do for her. It kinda makes me feel like a failure of a mom or something you know? I’m a first time mom so any suggestions would be great...