My hips and knees ache, and now my elbows are starting to ache as well. My buttocks ache, and my thighs ache. I have a sharp, constant pain down my right leg from my buttock. Fatigued and stiff, too. I fell and bruised my tailbone last June-the pain subsided, then came back in December. I am 54, and a woman. What on earth is going on with me?