Thanks for the query to ATD for an opinion,
You are likely to be suffering from cystitis which seems to be chronic and hence you are passing flakes and air through penis. You may get a urine culture and sensitivity done and isolate the infectious organism. You need to meet a urologist and get yourself evaluated and may have to be treated with a course of antibiotics for a week. This is likely persistence of UTI or a recurrence.
I hope i have answered your query,
Wishing you good health,
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