What is going on with my body?

[BigJays_babygirlforever87]

Started my monthly and all a sudden I had so much severe pain on my right lower side of my back so at first I just thought it was from my monthly it has gotten so bad I am not even able to stand for no longer than 10 seconds it intensifies every time I move but when I lay down or sit down the pain goes away but when I actually stand up on my feet and walk I can barely stand up straight and can only be on my feet for a couple seconds before I am screaming in pain has this happened to anybody else before????

[BigJays_babygirlforever87]

Also the pain is shooting all the way down to my leg now and at times I can even feel it in my foot kind of feeling like a pinched nerve but it's not and I do have kidney stones but I have never had a kidney stones that hurt this bad