lower back pain kidney area

Intense lower back pain upon waking up?
Last Thursday at work i started to get really back pains in my lower back on the left side around the kidney area. It hurt to sit, stand and bend over. I didn’t think much of it.
However, Friday morning i woke up with terrible pains only on the left side again, and it hurt to sit, stand and bend over once again.
Then as I woke up Saturday and today I had extreme pains in the same area. The pain seemed to lessen after I was awake for a bit, but it really hurts right when i wake up, and occasionally through out the day.
Is there something wrong with me? Or is it possible I’m just sleeping weird?
I’ve been reading a great book that has a lot in it about lower back pain. It tells you the root cause, and how to treat it. And, there are instructions on how to adjust your back. that’s the main thing that it’s about.
The main thing is to stop eating junk food if you do. It made all the difference for me, my back was feeling better in a couple of days.
here’s the website, video in the tab for the book
How to find immediate pain relief (pain relief) The bionic band (the bionic band)12