What Causes Random Sharp Pain In Abdomen Along With Elevated White Blood Cells?

Hi, Over the past 2 years I have gotten a UTI/kidney infection every 2-3 months. Over the summer, I started having random sharp pains in my stomach. I was treated for another kidney infection. Between summer and now, I have had periods with no pain and periods where I feel dull aches in my lower stomach and sharp pains in the same area. I recently saw my doctor again and had a urinalysis and blood test. Everything was normal except for an extremely high level of white blood cells in my urine and bun/creatine ratio of 23. What does this mean?