Thanks for your query.Based on the facts that you have posted it appears that you have acquired Chronic Prostatitis
following unprotected sex with call girls.
Chronic prostatitis takes long time to get cured and relapses are known to occur even after taking antibiotics.
The size of the prostate
on your recent ultrasound
study is just 22 gm and signify mild enlargement.
It is the chronic infection of the prostate which is the cause of your symptoms.
Please take antibiotics as per advice of your Urologist
It should get cured within a month.