What may cause a shooting pain (like a knife) starting in my right buttocks and across my lower back and into my lower abdominal? It started Thursday with a sore lower back and tender abdomin. Over night, I woke really achy and this extreme pain continued whenever I moved. Even urinating or pushing slightly for a bowel movement. Along with this pain, I just ache. I have a very, very high tolerance for pain, and I can t remember the last time I didn t feel well. Maybe 3 years ago, and I had similar symptoms. My doctor diagnosed it as the flu. I am also waking up soaked from head to toe for the past couple of days I took 2 doses of Bayer back and body yesterday and one dose of Bayer 325 today. Karen