Hey it might just be something like trapped sope our something like that something simple
Do you have increased frequency of passing urine?
Does your pain increase toward the end of passing urine?
It appears that you could have a urinary tract infection.
You will need to have a urinalysis to check for infection and, if positive, a culture sensitivity report to identify which antibiotic the infective organism is sensitive to.
Meanwhile, you can do the following:
Drink fluids in excess of 2000 ml (8 glasses) per day.
Take as much citrus and cranberry juices as possible.
Take tylenol every 4-6 hours for the pain.
Use a heating pad over your lower back and abdomen if you develop pain.
See your doctor at the earliest to be prescribed a course of antibiotics.
Do keep us posted on your doubts and progress.