Hi I Am 27 Years Old Male, Having Pain Near

hi i am 27 years old male, having pain near the monkey bone since 2 days. My job involves travelling on bike mostly. I dont remember any kind of recent injury or jerk to be the cause. Had taken one combiflame yesterday night, which reduced pain n i could get some sleep. But by morning the pain was back so have taken one more combiflame. can u suggest me a remedy