Thanks for your query.Based on the facts that you have posted it appears that you have Chronic UTI and not prostatitis
Please get your routine urine test and urine culture done to find out the organisms causing this infection and antibiotics to which they are sensitive to.
Please start taking broad spectrum antibiotics along with urinary antiseptics like Nitrofurantoin
along with urine alkaliser twice daily and later on switch on to appropriate antibiotic as per culture report.
Get the prescription of medicines from your family Physician.
Ensure to drink more water.To keep your urine dilute This will help to control dysuria