Thanks for your query.Based on the facts that you have posted it appears that you have
pain in lower abdomen and fels to pass urine immediately after passing urine .
This is most likley to be due to infection of the Prostate
Please consult qualified urologist
for clinical and digital rectal examination
to confirm the diagnosis.
A routine urine test and urine culture will help to trace out the organisms and to take appropriate antibiotics to combat the infection.