Omg crying so much at 6 months

My little one has not stop crying for about an hour!!! I've tried everything nothing calms her down and I'm extremely overwhelmed... She's been doing this lately especially if you put her down I don't know what to do anymore. With my first LO I didn't have this she was sooooo calm with everything. My lo now cries sooo much and as if she's on so much pain I just don't know what to do anymore