Hi, I am a 23 year old female, weight is around 190. I have had back pain that comes and goes since the delivery of my son six months ago. I have seen a Dr. for the back pain and was told it is muscular. When the pain occurs, it is so severe that it causes vomiting, it usually only last for about 12 hours. But I have had back pain, stomach cramps, vomiting, and very dark urine since Saturday. Thinking I need to see a Dr. but feel I will be told it is just muscular, but the dark urine is a new symptom. Thanks for any advise.