Hello! Thank you for the query. Liver cyst, kidney cyst is very common finding. Cyst is just an empty space in the organ filled with clear fluid. If most of your kidney is healthy (I do not know what do you mean by tiny cyst and how many of them is there), cysts are completely harmless and should not give any symptoms at all. You should have them under observation. Your WBC level can indicate an inflammation process or blood issue (like leukemia). Its really hard to tell about the source of infection not being able to perform physical examination. Stomach infection rather does not give symptoms for so long time. I suggest you to consult hematologist with your results. Hope this will help. Regards.