I've been having major cramping lately but it's on and off. Also, I had pains in my back every time…

I've been having major cramping lately but it's on and off. Also, I had pains in my back every time I would breathe. The day after my hips started hurting and hurt when I peed and I was told it was my kidneys. It stopped the next and now only my left one hurts. Any ideas of what it could be?