Hallo Thanks for your query.You have a problem of frequent urge for urination and back ache This could be due to stone in your urinary system
probably in distal ureter.Please get your Urine test and Ultrasound
scanning of the abdomen to rule out this.Consult some Urologist
and in the meanwhile take Tab Ciprofloxacin
500 mg and antispasmodics like Tab Cyclopam twice daily.