I recently had a CT scan done because of low, left side abdomanal pain that has been going on for about 2 months. My CT scan showed a sac filled with fluid, and a possible kidney stone in my left kidney. Can anyone tell me what the Sac of fluid might be in my stomach? I have a follow up appointment scheduled with my family doctor, but it's not for a couple of days and im very worried. IM a 35 year old female..