Hi sunni.
I have almost exactly the same problem as you. Chronic lower back pain (going on about three years), and then suddenly, an unexplained onset of pain in the upper back area. Extreme sensitivity to all surfaces, including chairs and bed. I can't lie down on my back for instance.
I've done two x-rays so far, which haven't revealed much (according to my gp). I've tried physio-theraphy and acupuncture. The acupuncture helped for a while, but now i'm back to square one. I'm not sure where else to go with this. I'm considering the services of a chiropractor and i'm saving up for this, but cash is tight.
Does your pain originate from a particular point on your spine as it does mine ? My problem appears to originate from one of the vetebrae right in the middle of my back. It feels like someones got a screwdriver stuck in there.