Thanks for your query,based on the facts that you have posted it appears that you have chronic prostatitis
since last 5 years and have been taking antibiotics with poor results.
Chronic prostatitis is very difficult to get eradicated completely even with taking antibiotic medicines regularly.
One can get satisfactory results with daily prostatic massage
for a period of 4-6 weeks .
I have been practising this modality for my patients of Chronic prostatitis for last 40 years my practice.
Though it sound cumbersome and need help of a trained heath personnel it gives satisfactory and encouraging resutls.
Please try it.