1. Whether your pain is radiating to legs or localised to back.
2. Bony pain may occur in hemolytic anemia
3. At age of 47 degenerative disorders of spine are common cause of low back pain
4. Funny taste in mouth , are you taking some medicines or had some recent illness
5. I think you consult a physician get thorough clinical checkup and blood and radiological investigation as required.
Hope this helps.
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