Pleurisy???????????? But in lower back?

I think I have probably definatley got pleuirsy, I get sudden, crippling pain that is relived by shallow breaths and made worse by deep breaths. It never last longer than a min, and dosn't come that often. I have SLE (lupus) so it does seem likely but the only weird thing is it seems to be in my Kindey area most of the time, and sometimes my chest area, but the pain is nowhere near as bad...is this possible?