I have never ever had a problem with my back.. I dont know what happened but i can barely walk! Serious severe sharp pain just shoots down my leg bone when i walk! Even standing hurts, sitting hurts i can barely walk i have to lay down and that will sort of take some pain away. I took 800mg ibuprofen and my back laughed at the pill.. This hurts so bad! Any advice ?! 3rd day with this pain still feels like day1! Dont even know where it came from ?! must have been in the gym..?