My child will NOT stop crying...help!

Does anyone have a child that never stops screaming and crying? My one year old is my third kid and she NEVER stops crying. All night. All day. Anytime I go out of a room or put her down. She just had her physical and she is 100% fine and is not teething. I’m really losing my cool and am constantly crying. My husband says let her cry it out and I just can’t listen to it anymore. I have no idea what to do.