CRP, as Tobagotwo has indicated, is a measure of nonspecific inflammation. There's a supplement, manufactured by New Chapter, that can be helpful (Zyflamend) if they can't determine exactly where the inflammation is coming from. It's composed of some fairly standard herbs (rosemary, ginger, tumeric, holy basil, green tea) that seem to work when you can't take lots of NSAIDS and stuff for pain. But I took it with the blessing of my DO, and only while we were waiting for the inevitable valve surgery. If tests can locate the source (sometimes it's as simple as a dental problem) you can do something about it fairly easily. Back-related inflammation seems like a good suspect in your case, so that should certainly be pursued as the cause (especially with related fever).