I have had lower back pain for over twenty years. It comes, it hurts and it goes.
If my current sore back is muscular then it disappear in time.
There is a pain to the right of my spine at waist height. It is not sore all the time, there are spasms in the area and it is extra bad when I try to go from standing up to lying down.
Question ... is it safe to assume this is just muscle related and hope it goes away soon? I don't feel any more crap than usual.
I'd be phoning my osteopath to come have a look at me. Aches and pains can come from anywhere but a proper hands-on operator should be able to nudge everything back into place.
Don't ask me how to find one, though, it's just trial and error, especially if you've recently moved.
... An ice pack thing helped but it burnt my skin. Hot water bottle s in flat, in a box behind the new kitchen that is sitting in the spare bedroom. :-(