Excruciating back pain on period.

Okay,honestly this is the worst pain I'm the world. Got no sleep last night. Was up crying I'm pain and frustration. I get what I call spasms when I try to turn over in bed but the pain is also consistent .. often worse when laying on my back. It worsens my posture while walking because it hurts so bad. This morning I could barely put my pants on because bending caused more spasms and crossing my leg while sitting here to type this.. ya right. So painful. It started on Thursday night and I was due to start AF friday.. which I did.. the pain continues.. anyone dealing with similar things?