Sharp Lower Back Pain

Last night at 2:30am , I woke to a terrible sharp pain in my lower back. I got up and went into the bathroom. While sitting there the pain felt like a cramping(almost like labor pains) it lasted for about 1 minute. I sat that getting my breath back. Then on came another one which last about the same. I had two more of these. While this was happening , I got sick to my stomach also.. Does anyone have any idea what this may be? It hurt like heck and scared me to death.. Let me know if anyone's experienced this. Someone was telling me it may be kidney stones. I feel fine today.