Understand your concern
I think it is due to bladder/lower urinary tract
stone as you have soreness in the lower part.
Other causes are:
Cystitis/lower urinary tract infections, prostate
enlargement (if along with nocturia and urgency).
You should consult the urologist
for proper diagnosis. Following investigations should be done: USG of KUB region, urine test: routine, culture and microscopy, PSA, Kideney function test, ESR, CBC.
meanwhile take following advice:
Drinlk lots of fluids, eat fruits like cranberry, orange, pine apple.
Tablet cefexime plus nitrofurantoin
After diagnosis take treatment specific to disease.
Hope this may help you