Back hurts

I'm not sure what in the heck I did to my back, but it hurts all across the back of my ribcage and down to my hips. Just a deep muscle ache that leaves me wanting to curl up on the bed and go back to sleep until it quits hurting. I think it is that my desk is at the wrong height here and it's starting to get to me on a muscular level. I need to take a good long hot bath to fix it, but don't have the time to do that until later tonight.