Jan, the Soma and percocet seem to help. But I don't know yet what's causing the problem--if it's disc or muscle, probably muscle but ya never know.
Main problem areas right now are lower back (lumbar spine) and thoracic--right between shoulderblades and just below them. After I see the spine doc when I get back from the trip I should have a better idea. It hurt to breathe for quite some time--intercostal muscles seemed to be in spasm too. Yikes! I feel for you with what you're describing.
Thanks, Beary! I'm holding. But the plane ride actually is making me nervous--I won't really be able to walk around too much or lie down to sleep, so I'll have constant pressure on my back. Maybe it'll miraculously clear up tomorrow.