Sence I Was In My Twentys,i Have Had Muscle And

sence i was in my twentys,i have had muscle and joint pain,,worse at night,worse if any kind of stress,,shooting pain in my outter thigh area hips and legs,,been put on prednisone which helps for a week or so then it comes back and some times worse,,took every insaid on the market,,and it just releives the pain to where i can stand it,,had to quite my job,,still my drs.do not have a definate diagnosis,,whats wrong with me