Are high PSA levels and occasional frequent urination suggestive of kidney infection?

Hello doctor,

I am a 31-year-old male with a normal BMI, and no other known health issues, non-smoker, non-drinker, and no drug use ever. My appendix got removed 10 years ago. I have been experiencing high PSA and occasional frequent urination for one year now. The latest total PSA is 9.95. Urine or semen culture is always negative for bacteria so I decided to wait for EPS before taking Ciprofloxacin. I have taken fosfomycin empirically for two weeks last month, symptoms subsided but came back a few days after Abx termination. Lately, feeling a bit under the weather, I do not have but definitely feeling weak and malaise-like. Some flank right-side discomfort is also present. So I decided to do some tests. My concerns and questions are:

1. Is this kidney infection from the lower urinary tract?

2. Why were hyaline cast and renal tubular epithelial cells found?

Seems high amounts, especially RTECS. Very concerned since RTECS with a hyalin cast can suggest something.

3. What do you suggest I should do next? Please suggest further tests and medication. I also read if left untreated, long-term kidney scarring can happen. Hoping it is just an infection that Abx can handle and not something else like acute tubular necrosis. Pleae help.