Thanks everyone who made a positive suggestions and concerns. Sometimes we can get confused because of certain conditions. I did three RAT tests (of course bloody Chinese crappy ones) on three days, all reported negative. I knew something was wrong but until the urine symptoms appeared three days later, I had no other symptoms.
However, this is what I didn't tell you. On Saturday evening the PCR test results came with Positive Covid report. The urine and blood culture reports came out the next day (takes time) - no infections detected and quite normal.
So I knew what's wrong and didn't worry about it at all. As soon as the PCR result came, I took out an old test kit,
two months past expiry - but made by Abbot - South Korea. It's a Generation 1 test made for the original Wuhan virus. That reported positive. Then I tested my wife and son using the Korean test kit, they both were negative. Tested myself and still negative for the Chinese RAT.
Since I had no respiratory symptoms the viral shedding must have been low so that the others around me didn't get infected. The Chinese crap RAT tests are either have very low sensitivity or just fakes. They are still making money from the Wuhan virus.

These false negative RAT tests and the fact that I had no other typical symptoms made the difficulty in figuring out what's wrong with me.
I am alright now almost fully recovered, don't feel anything is crook with me anymore. This Covid virus only affected the urinary system & the bladder.
Though the exact mechanism of this is still unknown, many think that the coexpression of the ACE2 and TMPRSS2 in the prostate leads to inflammation.