Yoga will fix that.

I have had the same problem for about a month also. I just thought it was age and work!?

My back has been doing exactly how you described yours. I keep thinking I never lifted something heavy or overdo something, yet I've been dealing with this as well. I looked up if that could be a part of MS and it could be.
I've been stretching my back and using the heating pad and it helps a little

That could be part of MS. Has that ever happen before? Speak to your neurologist and or PCP. Try some Motrin & a heated blanket for that area.

I get a pain there too. It feel more like a cramp that won't go away.