For the last few months, if I hold in my urine too long, every now and then my left side hurts from my hip to the middle of my ribs (more toward the back but not on the back). But it doest seem like I even have to pee that bad to begin with until I get the pain. Today, I had more most severe left side pain that brought me to my knees and made me sick to my stomach. (no other symptoms) Lasted about 15 min. Now, few hours later I still have slight achiness in that area. I know I have not drank nearly enough water the last few days but had started day off with coffee. Am I dehydrated or could this be kidney stones?