Welcome to HCM.
There is no any urinary tract infection
according to your reports.
Most likely it could be due to passage of some small stones and crystals.
I would like to investigate you more,go for cbc,urine.rbs and usg abdomen to rule out any stone,crystals.
Drink more water and other liquids.Continue ampilox
for 7 to 10 days.
Take proper local care.
Keep in touch with your doctor.