Pain in urethra. With this condition.

Hello respected Doctors Greetings. I 39 yrs old unmarried female. Last week I tested my serum creatinine which was 0.75. My HB is 13.5. Hba1c is 4.5. No BP no thyroid issues. I have been observing that every year with the onset of Summer during April my urethra gets  irritated and there is pain too. The urine output is less and sometimes more. Pls note I am not diabetic. The color Of the urine is sometimes yellow and sometimes not. I feel pain while and after passing urine. This condition continues for a month or two and then when the weather changes it becomes normal. No pain no irritation. I have done cystoscopy with no findings. Have done CT kub with no findings up to 15 times... Please help me. I am highly irritated with this condition. Thanks