You are suffering from recurrent UTI or calculus.
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Probably you are suffering from recurrent urinary tract infection
You need few investigations like routine hemogram,Random blood sugar,Urine RE/ME,Urine culture and sensitivity and Ultrasound
of abdomen.Further investigations can be done if needed.Source of recurrent UTI should be searched.
Ultrasound of abdomen can detect other associated pathology like calculus in kidney
Don't worry,you will be alright with antibiotics.Calculus will need additional treatment if it is there.
Bacteria might not be seen due to many reasons.
You can also take alkalizing syrup 1 TSf thrice daily for 5-7 days if recurrent UTI is diagnosed.
You should consult urologist
if problem is persistent.
Get well soon.
Hope i have answered your query.
Further queries are most welcome.