Can someone help me?

Okay, when I started it was like last month. It usually starts like a drop then the next day its bad. Well the first two days it was bad third day light four heavy again and fifth light again. All days but the third day I was cramping. And Ive been off for 2-3 days and I'm still cramping. And this morning my lower left kidney area is sore. I don't know if its my kidney or muscle. And I stay tired now.