A pain that is familiar

I have woken up experiencing more severe lower back pain and a burning sensation, it has made me kind of weak, but hang on this is a pain that I have had before, recently too. After a little research, because I have had diareah for a week or so, my problems may be down to magnesium levels being low, so have ordered a suppliment, So we will just have to see if right. but it has made me realise that my pain must have improved a lot recently, I'll get back yo as I was one way or tother