Girls, the problem is this: I feel like I need to go pee, even though …

Girls, the problem is this: I feel like I need to go pee, even though I went to the bathroom in the morning, there's such a pulling pain in my back passage, lying down fine, standing up hurts, can't get up from the stool, it's sharp pain, like something pinched somewhere, then it let go. Has anyone experienced this? What could be wrong?