Sorry I could not be more help,
Bernard Olson D.C.
If you are having low grade fever, frequent difficult urination with a burning sensation see an MD to rule out the possibilities that I mentioned in the first sentence of this response. If not, see a chiropractor.
Since this is new and have no injuries should first see your primary care physician. It's best to rule out an organ referral pain pattern (kidneys, prostrate, etc.) and get blood work. If no internal health problem are present then see a chiropractor. Chiropractors are doctors that specialize in back pain from biomechanics, disc, muscle, and nerve-related dysfunction.