If I was absolutely positive this was pano, I'd try something light, maybe tramadol--maybe. I'd have to research the options a little more.
My Chrissy had it probably 4-8 weeks and it was gone. Of course, back then, we didn't medicate like now (sometimes, imo that is a good thing and let's not start debating that here, in this thread--resurrect an old debate). When it hurt she laid down. I honestly don't remember it being that big a deal for her. I am sure each dog is different.